• IPA: /ˈkɹeɪzi/

crazy (comparative crazier, superlative craziest)

  1. (obsolete) Flawed or damaged; unsound, liable to break apart. [16th–19th c.]
    • 18, Thomas Babington Macaulay, chapter 3, in The History of England from the Accession of James the Second, volume (please specify ), London: Longman, Brown, Green, and Longmans, OCLC 1069526323 ↗:
    • They […] got a crazy boat to carry them to the island.
  2. (obsolete) Sickly, frail; diseased. [16th–19th c.]
    • 1663, Samuel Butler, Hudibras
      Over moist and crazy brains.
    • One of great riches, but a crazy constitution.
    • c. 1793, Edward Gibbon, Memoirs, Penguin 1990, p. 61:
      My poor aunt has often told me […] how long she herself was apprehensive lest my crazy frame, which is now of common shape, should remain for ever crooked and deformed.
  3. Of unsound mind; insane, demented. [from 17th c.]
    His ideas were both frightening and crazy.
  4. Out of control.
    When she gets on the motorcycle she goes crazy.
  5. Very excited or enthusiastic.
    • 1864, R. B. Kimball, Was He Successful?
      The girls were crazy to be introduced to him.
    He went crazy when he won.
  6. In love; experiencing romantic feelings.
    Why is she so crazy about him?
  7. (informal) Very unexpected; wildly surprising.
    The game had a crazy ending.
Synonyms Translations Translations Adverb


  1. (slang) Very, extremely.
    That trick was crazy good.
  • Russian: обалде́нно


  1. An insane or eccentric person; a crackpot.
    • 2011 Allen Gregory, "Pilot" (season 1, episode 1):
      Allen Gregory DeLongpre: Now drink up, you knuckleheads! Have a blast! It's our night, you crazies! Chloe, where are you?
  2. (slang, uncountable) Eccentric behaviour; lunacy.
Synonyms Translations
  • French: fou, folle
  • Portuguese: louco
  • Russian: сумасше́дший

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