20+ Slang for Crazy (Their Uses & Meanings)

What does Crazy Mean? (Meaning & Origin)

The term “crazy” is commonly used to describe behavior or ideas that are irrational, unconventional, or hard to understand. Originally from the English word “craze,” it historically stigmatized mental illness but is now often used more broadly and colloquially.

Slang Words for Crazy

1. Bonkers – Completely mad or irrational.
2. Nuts – Extremely foolish or crazy.
3. Loony – Very silly or crazy.
4. Wacko – Wildly irrational.
5. Unhinged – Mentally unstable.
6. Cuckoo – Foolish or crazy.
7. Batty – Irrational or crazy.
8. Off the Wall – Unpredictable, bizarre.
9. Zany – Comically absurd.
10. Deranged – Mentally disturbed.
11. Whacked – Extremely crazy.
12. Cracked – Mentally unsound.
13. Psycho – Violently deranged.
14. Out There – Unusual or strange.
15. Bananas – Highly irrational.
16. Freaky – Strange or bizarre.
17. Loco – Spanish for crazy, irrational.
18. Off One’s Rocker – Completely irrational.
19. Touched – Slightly crazy.
20. Haywire – Out of control.

Slang Words for Crazy person

1. Nutjob – A crazy person.
2. Lunatic – Wildly foolish person.
3. Crackpot – Irrational or bizarre person.
4. Fruitcake – Eccentric or mad person.
5. Nutcase – Insane person.
6. Madman/Madwoman – Extremely crazy person.
7. Loon – A silly or crazy person.
8. Headcase – Mentally unstable person.
9. Maniac – Wild or deranged person.
10. Psycho – Violently deranged person.

Use of Crazy Slang in Example Sentences

1. He went bonkers when he heard the news.
2. That idea is absolutely nuts.
3. She’s a bit loony, but fun.
4. His theories are totally wacko.
5. He seemed unhinged during the meeting.
6. That movie plot was absolutely cuckoo.
7. She acts batty sometimes, but we love her.
8. That suggestion was off the wall.
9. His antics are quite zany.
10. Avoid him; he’s deranged.
11. I felt whacked after the marathon.
12. Her logic was completely cracked.
13. Don’t engage; he’s a psycho.
14. His fashion sense is really out there.
15. Your scheme is bananas.
16. That was a freaky coincidence.
17. He went loco over the soccer match.
18. Grandma’s off her rocker if she believes that.
19. He seems a bit touched.
20. The plan went completely haywire.

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