crazy

UK:**UK and possibly other pronunciationsUK and possibly other pronunciations/ˈkreɪzi/US:USA pronunciation: IPA and respellingUSA pronunciation: IPA/ˈkreɪzi/ ,USA pronunciation: respelling(krā′zē)

Inflections of 'crazy' (n): npl: crazies
Inflections of 'crazy' (adj):
crazier
adj comparative
craziest
adj superlative

WordReference Random House Learner's Dictionary of American English © 2026
cra•zy /ˈkreɪzi/USA pronunciation   adj., -zi•er, -zi•est, n., pl. -zies. 
adj. 
  1. mentally unbalanced;
    insane.
  2. impractical;
    foolish;
    stupid:a crazy scheme.[be + ~ + to + verb]I thought she was crazy to get married.[it + be + ~ + to + verb]It was crazy to get married so young.
  3. Informal Terms very eager, excited, or enthusiastic:[be + ~ + about + object]He's crazy about computers.
  4. Informal Terms very fond of;
    attracted to;
    infatuated by:[be + ~ + about + object]She's crazy about him.
  5. Informal Termsunusual;
    very odd;
    bizarre:What a crazy hat he was wearing.
  6. drive someone crazy, [drive + object + ~] to annoy or bother someone greatly:The kids were driving him crazy.

n. [countable]
  1. Slang TermsSlang. an unpredictable person;
    one who behaves in an odd, bizarre, or foolish way.
Idioms
  1. Slang Terms like crazy, Slang. with great enthusiasm or energy;
    wildly: We worked like crazy all morning.

cra•zi•ly, adv.: We drove crazily to get there on time.
cra•zi•ness, n. [uncountable]

WordReference Random House Unabridged Dictionary of American English © 2026
cra•zy  (krā′zē),USA pronunciation adj., -zi•er, -zi•est, n., pl. -zies. 
adj. 
  1. mentally deranged;
    demented;
    insane.
  2. senseless;
    impractical;
    totally unsound:a crazy scheme.
  3. Informal Termsintensely enthusiastic;
    passionately excited:crazy about baseball.
  4. Informal Termsvery enamored or infatuated (usually fol. by about):He was crazy about her.
  5. Informal Termsintensely anxious or eager;
    impatient:I'm crazy to try those new skis.
  6. Informal Termsunusual;
    bizarre;
    singular:She always wears a crazy hat..
  7. Slang Termswonderful;
    excellent;
    perfect:That's crazy, man, crazy.
  8. likely to break or fall to pieces.
  9. weak, infirm, or sickly.
  10. having an unusual, unexpected, or random quality, behavior, result, pattern, etc.:a crazy reel that spins in either direction.
  11. Idioms like crazy:
    • Slang Termswith great enthusiasm or energy;
      to an extreme:We shopped like crazy and bought all our Christmas gifts in one afternoon.
    • Idiomswith great speed or recklessness:He drives like crazy once he's out on the highway.

n. 
  1. Slang Termsan unpredictable, nonconforming person;
    oddball:a house full of crazies who wear weird clothes and come in at all hours.
  2. the crazies, [Slang.]a sense of extreme unease, nervousness, or panic;
    extreme jitters:The crew was starting to get the crazies from being cooped up belowdecks for so long.
  • craze + -y1 1570–80
cra′zi•ly, adv. 
cra′zi•ness, n. 
    1. crazed, lunatic. See mad. 2. foolish, imprudent, foolhardy. 8. rickety, shaky, tottering.
    1. sane. 3. calm, dispassionate. 8. stable. 9. strong; healthy.
Collins Concise English Dictionary © HarperCollins Publishers::
crazy /ˈkreɪzɪ/ adj ( -zier, -ziest) informal
  1. foolish or irrational: don't do anything crazy
  2. wildly excited; out of control: the fans went crazy
  3. fantastic; strange; ridiculous: a crazy dream
  4. outrageous; excessive: at a crazy speed
  5. (postpositive; followed by about or over) informal extremely fond (of)
  6. offensive having a mental illness, esp one causing aberrant behaviour
 n ( pl crazies) slang
  1. derogatory a person considered as having extreme or irrational views
  2. offensive a person with a mental illness, esp one causing aberrant behaviour
ˈcrazily adv ˈcraziness n USAGE
Using an informal word to refer to mental illness, or people who have mental health problems, can be considered highly insensitive and should be avoided
'crazy' also found in these entries (note: many are not synonyms or translations):
barking - bats - bend - bent - bonkers - cracked - crackpot - crazy paving - delirium - dotty - flaky - gaga - gonzo - haywire - head-banger - Knowles - kook - kooky - loco - loopy - lunatic - mad - Perelman - porangi - potty - rocker - screwy - upside down - wall - wild - balmy - bananas - bat - batty - brainsick - buggy - bughouse - bugs - chump - come - cracker - crazy bone - crazy eights - Crazy Horse - crazy house - crazy quilt - crazy top - crazyweed - cuckoo - daffy
Collocations: is a crazy [man, dog, plan], have a crazy [idea, dream, suggestion], is a crazy [hat, color, style, T-shirt], more...

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