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Idioms are fun word phrases that mean something different than the actual words say. People use them to make talking and writing more colorful and exciting. In this article, you will learn fifty fun idioms related to an impossible task.
In this lesson, we’ll look at idioms that mean facing a tough challenge, doing something extremely hard, and chasing unreachable goals. Let’s get started and explore some of these helpful expressions.
Idioms for Impossible Task
1. Wild goose chase
Definition: A foolish and hopeless search for something that cannot be found or achieved.
Used in a Sentence: Looking for my lost red crayon in the whole park turned out to be a wild goose chase. / Solving the riddle felt like running on a wild goose chase.
Similar Expressions: Hopeless search / Waste of time
2. Needle in a haystack
Definition: Something that is almost impossible to find because it is hidden among too many similar things.
Used in a Sentence: Trying to find my specific blue Lego brick in the giant toy box was like looking for a needle in a haystack. / Finding the exact paper clip in the messy drawer felt like searching for a needle in a haystack.
Similar Expressions: Hidden object / Impossible find
3. Reach for the moon
Definition: Trying to achieve a goal that is way too difficult or out of reach.
Used in a Sentence: Expecting to score fifty goals in one soccer game is like trying to reach for the moon. / He loved to dream big, even when people told him it was like trying to reach for the moon.
Similar Expressions: Unrealistic goal / Impossible dream
4. Build castles in the air
Definition: Creating plans and dreams that are completely impossible to make real.
Used in a Sentence: Instead of doing homework, he sat by the window building castles in the air about flying cars. / Wishing for a pet dragon is just building castles in the air.
Similar Expressions: Daydreaming / Impossible plans
5. Bark up the wrong tree
Definition: Pursuing a completely mistaken path or trying to solve a problem the wrong way.
Used in a Sentence: If you think I took your pencil, you are barking up the wrong tree. / The detective realized he was barking up the wrong tree when looking for clues.
Similar Expressions: Mistaken path / Wrong guess
6. Cry for the moon
Definition: Asking for something that is completely impossible to get.
Used in a Sentence: Asking our teacher for a whole week of extra recess is like crying for the moon. / Wishing you could fly without a plane is just crying for the moon.
Similar Expressions: Wanting the impossible / Foolish wish
7. Carry water in a sieve
Definition: Trying to perform a task that fails completely because of how it is set up.
Used in a Sentence: Trying to hold soup in a paper bag is like trying to carry water in a sieve. / Fixing that leaky boat with holes is just carrying water in a sieve.
Similar Expressions: Doomed effort / Useless task
8. Pushing a boulder uphill
Definition: Working on an exhausting task that gets harder every single second.
Used in a Sentence: Trying to teach my stubborn puppy to sit still felt like pushing a boulder uphill. / Memorizing every math formula in one night was like pushing a boulder uphill.
Similar Expressions: Hard struggle / Endless effort
9. Trying to square a circle
Definition: Attempting to solve a problem that mathematical rules prove cannot be done.
Used in a Sentence: Fixing the broken plastic toy with sticky tape alone was like trying to square a circle. / Solving that riddle without any clues felt like trying to square a circle.
Similar Expressions: Impossible puzzle / Unsolvable task
10. Pull yourself up by your bootstraps
Definition: Trying to achieve success using only your own hard effort in an impossible situation.
Used in a Sentence: Lifting the heavy piano all by yourself is like trying to pull yourself up by your bootstraps. / He had to pull himself up by his bootstraps when the project fell apart.
Similar Expressions: Hard self-help / Tough effort
11. Catch the wind
Definition: Trying to capture or control something that is completely untouchable.
Used in a Sentence: Trying to keep secrets in a chatty classroom is like trying to catch the wind. / Stopping time from moving forward is like trying to catch the wind.
Similar Expressions: Impossible grip / Uncatchable force
12. Milk a bull
Definition: Expecting results from a situation that can never produce anything useful.
Used in a Sentence: Asking him to lend you money when he has none is like trying to milk a bull. / Expecting the broken vending machine to give free snacks is like trying to milk a bull.
Similar Expressions: Useless effort / False hope
13. Teach a fish to walk
Definition: Attempting to train someone to do something completely against their nature.
Used in a Sentence: Trying to make my lazy cat fetch a tennis ball is like trying to teach a fish to walk. / Getting our quiet classmate to shout on stage felt like trying to teach a fish to walk.
Similar Expressions: Impossible lesson / Futile training
14. Turn lead into gold
Definition: An old idea of trying to transform something worthless into something valuable.
Used in a Sentence: Expecting my messy bedroom to clean itself is like trying to turn lead into gold. / Trying to win the art contest with scribbles felt like turning lead into gold.
Similar Expressions: Magical fix / Impossible change
15. Fit a square peg into a round hole
Definition: Trying to force something to fit where it clearly does not belong.
Used in a Sentence: Putting that large book into the tiny backpack is like trying to fit a square peg into a round hole. / Making my schedule work with yours feels like fitting a square peg into a round hole.
Similar Expressions: Forced match / Wrong fit
16. Whistle a jig to a milestone
Definition: Trying to get a response or result from something that cannot care or move.
Used in a Sentence: Complaining about the heavy rain to the brick wall is like whistling a jig to a milestone. / Asking the silent statue for directions felt like whistling a jig to a milestone.
Similar Expressions: Useless talk / Ignored speech
17. Hold water
Definition: An argument or plan that is so weak it falls apart under simple testing.
Used in a Sentence: His excuse for missing homework did not hold water with the teacher. / The theory about the floating castle simply did not hold water.
Similar Expressions: Fall apart / Weak logic
18. Reach for the stars with a short stick
Definition: Trying to accomplish a grand feat with tools that are far too weak.
Used in a Sentence: Trying to paint the tall ceiling using a tiny watercolor brush is like reaching for the stars with a short stick. / Building a treehouse with only a butter knife is like reaching for the stars with a short stick.
Similar Expressions: Poor tools / Weak attempt
19. Slay a dragon with a toothpick
Definition: Trying to fight a massive and terrifying problem using tiny resources.
Used in a Sentence: Studying for five minutes before a huge final exam is like trying to slay a dragon with a toothpick. / Fixing the broken car engine with a paper clip felt like trying to slay a dragon with a toothpick.
Similar Expressions: Tiny weapons / Outmatched fight
20. Count your chickens before they hatch
Definition: Relying on a successful outcome before an impossible task is actually finished.
Used in a Sentence: Do not celebrate winning the science fair yet because that is counting your chickens before they hatch. / Planning a party before passing the test is counting your chickens before they hatch.
Similar Expressions: Premature hope / Early celebration
21. Beat a dead horse
Definition: Continuing to argue or work on a problem that is already finished and hopeless.
Used in a Sentence: Arguing about who dropped the popcorn box is just beating a dead horse. / Trying to fix that ancient computer is like beating a dead horse.
Similar Expressions: Useless effort / Pointless act
22. Catch lightning in a bottle
Definition: Trying to capture a moment of rare energy or achieve a miraculous feat.
Used in a Sentence: Creating a viral internet video on your first try is like trying to catch lightning in a bottle. / Reproducing that exact winning recipe is like catching lightning in a bottle.
Similar Expressions: Rare feat / Miraculous catch
23. Run before you can walk
Definition: Attempting an advanced and impossible task before learning the basics.
Used in a Sentence: Trying to solve calculus math in first grade is like trying to run before you can walk. / He tried to build a complex robot without reading instructions, running before he could walk.
Similar Expressions: Too fast / Skipping steps
24. Look for a black cat in a dark room
Definition: Searching for something when conditions make success completely impossible.
Used in a Sentence: Trying to find my lost contact lens on the dark carpet was like looking for a black cat in a dark room. / Searching for clues in the locked empty box felt like looking for a black cat in a dark room.
Similar Expressions: Blind search / Hidden quest
25. Plow the sea
Definition: Doing hard physical labor that leaves no mark or result behind.
Used in a Sentence: Sweeping the dust off the outdoor patio during a windstorm is like trying to plow the sea. / Arguing with someone who refuses to listen feels like plowing the sea.
Similar Expressions: Useless work / Vain effort
26. Throw caution to the wind
Definition: Taking a reckless risk on an impossible goal without planning.
Used in a Sentence: Guessing every answer on a difficult test means you throw caution to the wind. / Jumping off the high diving board without looking is throwing caution to the wind.
Similar Expressions: Reckless risk / Wild gamble
27. Reach for the sky
Definition: Setting goals that are so high they stretch your abilities to the absolute limit.
Used in a Sentence: Our basketball coach told us to practice hard and reach for the sky. / Dreaming of becoming an astronaut means you have to reach for the sky.
Similar Expressions: Aim high / Grand goals
28. Bite off more than you can chew
Definition: Taking on a task or project that is far too big and difficult to finish.
Used in a Sentence: Agreeing to bake five hundred cupcakes by tomorrow means you bit off more than you can chew. / He took on three class projects and realized he bit off more than he could chew.
Similar Expressions: Overwhelmed / Too much work
29. Swim upstream
Definition: Fighting against heavy rules or difficult conditions to reach a goal.
Used in a Sentence: Trying to finish this hard project without a computer felt like swimming upstream. / Opposing the new school rule felt like swimming upstream.
Similar Expressions: Hard fight / Against current
30. Split hairs
Definition: Arguing over tiny, unimportant details during an already complicated task.
Used in a Sentence: Stop arguing about spelling punctuation and let us finish this impossible project instead of splitting hairs. / We spent an hour splitting hairs over the rules of tag.
Similar Expressions: Overcomplicate / Tiny details
31. Walk on water
Definition: Expecting someone to perform a literal miracle to solve a problem.
Used in a Sentence: Expecting me to finish this giant puzzle in five minutes is asking me to walk on water. / The boss expects the new employee to walk on water right away.
Similar Expressions: Miracle worker / Impossible expectation
32. Build a mountain out of a molehill
Definition: Making a tiny and simple problem sound like an impossible disaster.
Used in a Sentence: Losing one colored pencil is not a crisis, so do not build a mountain out of a molehill. / She cried over a minor math error, building a mountain out of a molehill.
Similar Expressions: Overreact / Exaggerate much
33. Chase rainbows
Definition: Pursuing illusions, dreams, or goals that can never actually be reached.
Used in a Sentence: Spending all your allowance on lottery tickets is just chasing rainbows. / He spent years chasing rainbows instead of studying a real trade.
Similar Expressions: False dreams / Chasing illusions
34. Split the atom
Definition: A phrase used to describe trying to accomplish a task requiring extreme scientific precision.
Used in a Sentence: Trying to balance the club budget down to the exact penny felt like trying to split the atom. / Aligning all the puzzle edges perfectly is like trying to split the atom.
Similar Expressions: Extreme precision / Hard science
35. Make bricks without straw
Definition: Being forced to complete a project without being given the necessary supplies.
Used in a Sentence: Asking us to bake a cake without any flour is like making bricks without straw. / Trying to write a report without any books is like making bricks without straw.
Similar Expressions: Missing supplies / Hard assignment
36. Keep a lid on it
Definition: Trying to control a chaotic and overwhelming situation so it does not explode.
Used in a Sentence: The teacher tried to keep a lid on the excited classroom before the bell. / Managing the noisy puppy party required us to keep a lid on it.
Similar Expressions: Control chaos / Contain mess
37. Square the circle
Definition: Solving a problem that has rules making a correct answer impossible.
Used in a Sentence: Trying to satisfy both of my arguing friends felt like trying to square the circle. / Designing a backpack that weighs nothing while holding bricks is trying to square the circle.
Similar Expressions: Impossible fix / Unsolvable puzzle
38. Balance an egg on its tip
Definition: Performing a delicate, nerve-wracking task that requires impossible balance.
Used in a Sentence: Walking across the icy sidewalk without slipping felt like balancing an egg on its tip. / Getting the tower of blocks to stand was like balancing an egg on its tip.
Similar Expressions: Delicate task / Wobbly balance
39. Empty the ocean with a spoon
Definition: Attempting a monumental task using tools that are ridiculously too small.
Used in a Sentence: Cleaning the massive school stadium with a toothbrush is like emptying the ocean with a spoon. / Reading every book in the library in one day is like emptying the ocean with a spoon.
Similar Expressions: Useless tool / Massive job
40. Put the cart before the horse
Definition: Doing things in the wrong order, making an easy task feel impossible.
Used in a Sentence: Trying to paint a model car before building it is putting the cart before the horse. / Buying party supplies before inviting guests is putting the cart before the horse.
Similar Expressions: Wrong order / Backward steps
41. Stretch the truth
Definition: Exaggerating a story so much that the facts become unbelievable.
Used in a Sentence: Saying you caught a fish as big as a car is really stretching the truth. / He kept stretching the truth about how fast he could run.
Similar Expressions: Exaggerate / Tall tale
42. Ride two horses at once
Definition: Trying to handle two conflicting and impossible tasks simultaneously.
Used in a Sentence: Trying to play soccer and basketball at the exact same minute is like riding two horses at once. / Managing two club meetings at once is riding two horses at once.
Similar Expressions: Divided focus / Conflicting tasks
43. Grasp at straws
Definition: Desperately trying any wild idea when facing a hopeless failure.
Used in a Sentence: When his computer froze, he started clicking random keys, just grasping at straws. / With no answers left on the test, she began grasping at straws.
Similar Expressions: Desperate try / Wild guess
44. Reach for the impossible
Definition: Setting your sights on a goal that defies all physical limits.
Used in a Sentence: Training to jump over a house is reaching for the impossible. / Kids love to imagine stories about reaching for the impossible.
Similar Expressions: Boundless goal / Unreachable aim
45. Find a needle in a bottle of hay
Definition: A variation of searching for something hidden in an impossible pile.
Used in a Sentence: Looking for my lost contact lens in the tall grass was like finding a needle in a bottle of hay. / Locating the signed baseball card in the attic boxes felt like finding a needle in a bottle of hay.
Similar Expressions: Hidden search / Impossible find
46. Swim against the current
Definition: Struggling continuously against strong opposing rules or forces.
Used in a Sentence: Trying to convince the whole class to change the game felt like swimming against the current. / Building a business during a recession is like swimming against the current.
Similar Expressions: Hard fight / Opposing force
47. Sisyphus task
Definition: An endless, frustrating chore that must be repeated forever with no result.
Used in a Sentence: Cleaning the kitchen floor while the toddler drops crumbs is a true Sisyphus task. / Erasing and rewriting the same math problem felt like a Sisyphus task.
Similar Expressions: Endless chore / Frustrating labor
48. Build on sand
Definition: Creating a project on a weak foundation that will collapse immediately.
Used in a Sentence: Writing an essay without an outline is like building on sand. / Starting a business plan without research is building on sand.
Similar Expressions: Weak base / Fragile plan
49. Chase shadows
Definition: Spending energy pursuing things that have no substance or reality.
Used in a Sentence: Trying to catch the ghost stories in the old barn was just chasing shadows. / Worrying about things that might never happen is like chasing shadows.
Similar Expressions: Chasing ghosts / Unreal pursuit
50. Mission impossible
Definition: A popular phrase for a task that seems completely unable to be completed.
Used in a Sentence: Finishing fifty math problems in ten minutes felt like a mission impossible. / Getting the cat into its travel carrier was a true mission impossible.
Similar Expressions: Unbeatable task / Hopeless mission
Exercise to Practice
- Looking for my lost red crayon in the whole park turned out to be a wild goose chase.
- Trying to find my specific blue Lego brick in the giant toy box was like looking for a needle in a haystack while flying to Mars.
- Instead of doing homework, he sat by the window building castles in the air.
- Trying to hold soup in a paper bag is like trying to carry water in a sieve.
- Fixing that leaky boat with holes is just carrying water in a sieve while swimming in outer space.
- Putting that large book into the tiny backpack is like trying to fit a square peg into a round hole.
- Complaining about the heavy rain to the brick wall is like whistling a jig to a milestone while turning into a tree.
- His excuse for missing homework did not hold water with the teacher.
- Studying for five minutes before a huge final exam is like trying to slay a dragon with a toothpick.
- Trying to fix that ancient computer is like beating a dead horse while melting into ice cream.
- Trying to solve calculus math in first grade is like trying to run before you can walk.
- Sweeping the dust off the outdoor patio during a windstorm is like trying to plow the sea while baking a chocolate cake.
- Trying to play soccer and basketball at the exact same minute is like riding two horses at once.
- Cleaning the kitchen floor while the toddler drops crumbs is a true Sisyphus task.
- Starting a business plan without research is building on sand while painting your dog purple.
Answer Key
- True
- False
- True
- True
- False
- True
- False
- True
- True
- False
- True
- False
- True
- True
- False
Conclusion
Learning these idioms helps you describe difficult challenges and tough situations in a colorful and fun way. When you use creative words, your stories and talks about overcoming hard obstacles become much more engaging.
Try using one or two of these expressions the next time you face a hard project or write a story at school. You will see how exciting it is to bring your everyday language to life!
Frequently Asked Questions
What are some common idioms for an impossible task?
Some popular idioms for an impossible task include wild goose chase, needle in a haystack, and reach for the moon. People use these expressions to talk about hard challenges, hopeless searches, and unreachable goals in daily life.
Why do we use idioms in English?
Idioms make our language much more colorful and interesting than plain words alone. They help us share feelings and pictures in our minds quickly and clearly.
How can I learn more idioms easily?
You can learn new idioms by reading fun stories, listening to how people talk, and practicing them in your own sentences. Writing down your favorite phrases in a notebook is also a great way to remember them.
Are idioms used in everyday speech?
Yes, people use idioms every day when talking with friends, family, and classmates. They help make ordinary conversations sound lively and engaging.
Can idioms have more than one meaning?
Most idioms have one main accepted meaning, but people can use them in different fun contexts. Always check the definition and sample sentences to make sure you use the phrase correctly.
