50 Idioms for Going Crazy With Meanings & Sentences
Idioms for Going Crazy
1. Go Off the Deep End
Meaning: To suddenly become very angry, emotional, or irrational.
In a Sentence: He went off the deep end when he found out his car was towed.
Other Ways to Say: Lose it, Blow a fuse
2. Lose Your Marbles
Meaning: To act in a silly or unusual way, as if you’re crazy.
In a Sentence: Grandma thinks I’ve lost my marbles because I talk to my plants.
Other Ways to Say: Lose your mind, Act silly
3. Go Bananas
Meaning: To become very excited, silly, or crazy.
In a Sentence: The kids went bananas when the ice cream truck arrived.
Other Ways to Say: Go wild, Act nuts
4. Drive Someone Crazy
Meaning: To annoy or make someone feel upset.
In a Sentence: My little brother drives me crazy when he copies everything I say.
Other Ways to Say: Drive someone nuts, Annoy
5. Out of Your Mind
Meaning: To be acting in a completely irrational or mad way.
In a Sentence: Are you out of your mind? You can’t skydive without training!
Other Ways to Say: Insane, Nuts
6. Off One’s Rocker
Meaning: Acting in a strange or crazy way.
In a Sentence: He must be off his rocker to think that plan would work.
Other Ways to Say: Loopy, Wacky
7. Go Nuts
Meaning: To become crazy with excitement or frustration.
In a Sentence: Fans went nuts when their team scored in the final seconds.
Other Ways to Say: Go wild, Flip out
8. Climb the Walls
Meaning: To feel extremely anxious, bored, or restless.
In a Sentence: I was climbing the walls during the power outage.
Other Ways to Say: Go stir-crazy, Feel trapped
9. Crack Up
Meaning: To break down emotionally or mentally.
In a Sentence: He cracked up after working too many hours without rest.
Other Ways to Say: Break down, Snap
10. Bonkers
Meaning: Extremely crazy or foolish.
In a Sentence: She went bonkers when she saw her surprise birthday party.
Other Ways to Say: Mad, Loony
11. Cuckoo
Meaning: Silly or mentally unbalanced.
In a Sentence: He’s acting totally cuckoo over that video game.
Other Ways to Say: Nuts, Batty
12. Batty
Meaning: Slightly crazy or eccentric.
In a Sentence: That batty old man talks to his shoes.
Other Ways to Say: Weird, Odd
13. Lose It
Meaning: To suddenly become very angry or emotional.
In a Sentence: I totally lost it when I missed my flight.
Other Ways to Say: Snap, Break down
14. Go Haywire
Meaning: To act in a confused or out-of-control way.
In a Sentence: The computer system went haywire after the update.
Other Ways to Say: Malfunction, Freak out
15. Off the Rails
Meaning: To behave in an uncontrolled, chaotic manner.
In a Sentence: After losing his job, he went completely off the rails.
Other Ways to Say: Out of control, Unhinged
16. Nuts About
Meaning: Obsessed or crazy in love with something or someone.
In a Sentence: He’s nuts about vintage cars.
Other Ways to Say: Crazy for, Mad about
17. Go Berserk
Meaning: To act in a violently wild or irrational way.
In a Sentence: The fans went berserk after their team won.
Other Ways to Say: Go wild, Rage
18. Mad as a Hatter
Meaning: Completely insane.
In a Sentence: He’s mad as a hatter if he thinks that’ll work.
Other Ways to Say: Totally crazy, Bizarre
19. Blow a Fuse
Meaning: To become very angry suddenly.
In a Sentence: Mom blew a fuse when she saw the mess in the kitchen.
Other Ways to Say: Explode, Lose temper
20. Round the Bend
Meaning: Acting mentally unstable.
In a Sentence: She’s going round the bend from all the stress.
Other Ways to Say: Losing it, Off your rocker
21. Loony Bin
Meaning: A mental hospital (informal/slang).
In a Sentence: He joked that he was heading for the loony bin after finals week.
Other Ways to Say: Asylum, Crazy house
22. Out to Lunch
Meaning: Not fully aware or alert, acting spacey.
In a Sentence: She seemed out to lunch during the meeting.
Other Ways to Say: Zoned out, Distracted
23. Crazy Like a Fox
Meaning: Seemingly crazy but actually clever.
In a Sentence: He acts foolish, but he’s crazy like a fox in business deals.
Other Ways to Say: Sneaky smart, Cunning
24. In a Tizzy
Meaning: Agitated or confused.
In a Sentence: She was in a tizzy before her big presentation.
Other Ways to Say: Flustered, Frazzled
25. Wig Out
Meaning: To lose control emotionally or mentally.
In a Sentence: He wigged out when the dog chewed his shoes.
Other Ways to Say: Freak out, Panic
26. Lose Your Head
Meaning: To lose control in a stressful situation.
In a Sentence: Try not to lose your head during the exam.
Other Ways to Say: Panic, Get flustered
27. Pop a Vein
Meaning: To become extremely angry.
In a Sentence: He nearly popped a vein when he saw the scratch on his car.
Other Ways to Say: Rage, Blow up
28. Knocked Loopy
Meaning: Confused, disoriented, or acting weirdly.
In a Sentence: That roller coaster knocked me loopy!
Other Ways to Say: Dizzy, Spaced out
29. Flip Out
Meaning: To suddenly lose control.
In a Sentence: She flipped out when she saw the spider.
Other Ways to Say: Panic, Lose it
30. Gone Around the Bend
Meaning: Become mentally unstable.
In a Sentence: He’s gone around the bend with all these conspiracy theories.
Other Ways to Say: Cracked, Snapped
31. Have Bats in the Belfry
Meaning: To be a little crazy or eccentric.
In a Sentence: People say the old inventor has bats in the belfry, but he’s really just a genius.
Other Ways to Say: Be odd, Be kooky
32. Out of One’s Head
Meaning: Acting irrationally or foolishly.
In a Sentence: You must be out of your head to try skydiving in this weather!
Other Ways to Say: Out of your mind, Acting foolish
33. Crazy Like a Fox
Meaning: Appearing silly but actually very clever.
In a Sentence: Don’t underestimate her—she’s crazy like a fox.
Other Ways to Say: Cleverly deceptive, Shrewd
34. Blow a Fuse
Meaning: To become very angry or upset quickly.
In a Sentence: Dad blew a fuse when he saw the broken TV.
Other Ways to Say: Lose it, Explode
35. Go Bonkers
Meaning: To behave in a wild or crazy way.
In a Sentence: The kids went bonkers when they saw the magician.
Other Ways to Say: Go wild, Act insane
36. Off the Deep End
Meaning: To become irrational or overly emotional.
In a Sentence: She went off the deep end after hearing the bad news.
Other Ways to Say: Overreact, Lose control
37. Lose It
Meaning: To become very emotional or mentally unstable.
In a Sentence: I completely lost it when I saw the mess in the kitchen.
Other Ways to Say: Break down, Freak out
38. Off One’s Rocker
Meaning: Acting crazy or strange.
In a Sentence: He’s off his rocker if he thinks he can finish all that work in an hour.
Other Ways to Say: Nuts, Loony
39. Go Wild
Meaning: To behave uncontrollably.
In a Sentence: The fans went wild after the winning goal.
Other Ways to Say: Go crazy, Lose control
40. A Few Screws Loose
Meaning: Mentally unstable or strange.
In a Sentence: That guy has a few screws loose—he talks to his shoes.
Other Ways to Say: Not all there, A bit off
41. Mad as a Hatter
Meaning: Completely crazy or eccentric.
In a Sentence: The man who paints upside down is mad as a hatter!
Other Ways to Say: Totally bonkers, Nuts
42. Go Stir-Crazy
Meaning: To go crazy from being cooped up too long.
In a Sentence: I went stir-crazy during the lockdown.
Other Ways to Say: Get restless, Feel trapped
43. Flip Your Lid
Meaning: To become suddenly very angry or upset.
In a Sentence: He flipped his lid when he found out about the prank.
Other Ways to Say: Go off, Lose temper
44. Nutty as a Fruitcake
Meaning: Extremely eccentric or crazy.
In a Sentence: My aunt is nutty as a fruitcake but we love her stories.
Other Ways to Say: Wacky, Loopy
45. Go Haywire
Meaning: To malfunction or become chaotic.
In a Sentence: My computer went haywire and deleted everything!
Other Ways to Say: Go berserk, Get messed up
46. Hit the Roof
Meaning: To become extremely angry.
In a Sentence: Mom hit the roof when she saw the spilled juice.
Other Ways to Say: Explode, Freak out
47. Barking Mad
Meaning: Completely crazy.
In a Sentence: He must be barking mad to quit his job without a plan.
Other Ways to Say: Insane, Out of his mind
48. Round the Bend
Meaning: Going crazy or acting irrational.
In a Sentence: You’ll drive me round the bend with all these questions!
Other Ways to Say: Losing it, Going mad
49. Gone Off the Rails
Meaning: To start behaving in an uncontrolled way.
In a Sentence: He went off the rails after his breakup.
Other Ways to Say: Out of control, Going downhill
50. In Cloud Cuckoo Land
Meaning: Living in a fantasy or unrealistic world.
In a Sentence: If you think money grows on trees, you’re in cloud cuckoo land.
Other Ways to Say: Out of touch with reality, Daydreaming
