DictionaryAI

crazy

KRAY-zee/ˈkɹeɪ.zi/

Adjectivecrazier, craziest

Noun pluralcrazies

9 meanings of crazy

Practice

  1. 1
    wild (situation)adjective
    Wild and not under control.

    Traffic downtown gets crazy during rush hour.

    The weather has been crazy this week, going from sun to snow.

    UsageSay things got crazy.

    Similarwild, chaotic, hectic, frantic, manic

    Oppositecalm, quiet, orderly

  2. 2
    not saneadjectiveoffensive
    Mentally ill, or not able to think in a normal, healthy way.

    Like a mind that has stopped working the right way.

    People thought he was crazy because he heard voices that weren't real.

    After the accident she seemed crazy and could not tell what was real.

    UsagePeople say go crazy.

    Similarinsane, demented, deranged, mad, bonkers

    Oppositesane, rational, lucid

    Note
  3. 3
    surprisingadjectivecolloquial
    Very surprising and hard to believe.

    It's crazy that we ran into each other on the other side of the world.

    The ending of the movie was crazy, and nobody saw it coming.

    UsageSay it's crazy that it happened.

    Similaramazing, incredible, unbelievable, wild, astonishing

    Oppositepredictable, unsurprising

  4. 4
    very excitedadjective
    Liking something very, very much, or loving someone very much.

    Like a dog that jumps and barks when its owner comes home.

    My little sister is crazy about horses.

    He is crazy about her and calls her every night.

    UsageSay crazy about horses, or crazy about her.

    Similarmad, wild, passionate, enthusiastic

    Oppositeindifferent, apathetic, uninterested

    Note
  5. 5
    extremelyadverbslang
    Used before another word to mean 'very' or 'extremely.'

    The new restaurant is crazy expensive, but the food is worth it.

    It was crazy hot at the beach today.

    UsagePut it before a word: crazy hot. Say very in formal writing.

    Similarsuper, insanely, ridiculously, really, extremely

    Note
  6. 6
    lunaticnounslangcountable
    A person who behaves in a wild, strange, or foolish way.

    A crazy in the park was talking loudly to a tree.

    People called him a crazy because of his strange ideas.

    UsageMore than one is crazies. It can sound unkind.

    Similarlunatic, nutcase, psycho, kook, crackpot

    Note
  7. 7
    wild anticsnounslanguncountable
    Wild, strange, or out-of-control behavior.

    There was a lot of crazy at the family dinner last night.

    The show is full of crazy, and that's why kids love it.

    UsageSay a lot of crazy or full of crazy.

    Similarmadness, lunacy, insanity, chaos, mayhem

    Oppositesanity, calm

    Note

Less common meanings

  1. 8
    adjectiveobsolete
    Weak, broken-down, and likely to fall apart.
    Piles of mean and crazy houses.
    1849, Thomas Babington Macaulay, The History of England from the Accession of James the SecondHere, crazy means falling apart and likely to break.
    Buchanan shewed her into a room adjoining to Mr. Steele's dressing-room, and separated from it by a very crazy partition.
    1789, John Moore, Zeluco
    Note
  2. 9
    adjectiveobsolete
    Weak, frail, and often sick.
    Over moist and crazy brains.
    1663, Samuel Butler, HudibrasHere, crazy means weak or sickly.
    One of great riches, but a crazy constitution.
    1710, [Joseph Addison; Richard Steele et al.], “FRIDAY, March 17, 1709–1710”Here, crazy means weak and sickly in body.
    Note

Practice

Can you tell the meanings of crazy apart? Answer 3 quick questions from this page, or write your own sentence and AI will check it.

Origin

It comes from the word 'craze', which meant 'to crush', plus the ending '-y'.

Checked 31 Oct 2026 · 3 facts