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adjective, cra·zi·er, cra·zi·est.
  1. mentally deranged; demented; insane.
  2. senseless; impractical; totally unsound: a crazy scheme.
  3. Informal. intensely enthusiastic; passionately excited: crazy about baseball.
  4. Informal. very enamored or infatuated (usually followed by about): He was crazy about her.
  5. Informal. intensely anxious or eager; impatient: I'm crazy to try those new skis.
  6. Informal. unusual; bizarre; singular: She always wears a crazy hat.
  7. Slang. wonderful; 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.
noun, plural cra·zies.
  1. Slang. an 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.
  1. like crazy,
    1. Slang.with great enthusiasm or energy; to an extreme: We shopped like crazy and bought all our Christmas gifts in one afternoon.
    2. with great speed or recklessness: He drives like crazy once he's out on the highway.

Origin of crazy

First recorded in 1570–80; craze + -y1
Related formscra·zi·ly, adverbcra·zi·ness, nounhalf-cra·zy, adjective

Synonyms for crazy

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1. crazed, lunatic. See mad. 2. foolish, imprudent, foolhardy. 8. rickety, shaky, tottering.

Antonyms for crazy Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for crazy

Contemporary Examples of crazy

Historical Examples of crazy

  • He was acting like a crazy boy, and he was a man, all of twenty-two!


    Mary Roberts Rinehart

  • "I guess you know I've been crazy about him," she said quietly.


    Mary Roberts Rinehart

  • I don't think much of your Lauzanne, he's like a crazy horse.


    W. A. Fraser

  • I gits half eat by that crazy skate, an' fired without a cent fer it.


    W. A. Fraser

  • "You are crazy; so do not talk any more," interrupted Hubertine, coldly.

    The Dream

    Emile Zola

British Dictionary definitions for crazy


adjective -zier or -ziest
  1. informal insane
  2. fantastic; strange; ridiculousa crazy dream
  3. (postpositive; foll by about or over) informal extremely fond (of)
  4. slang very good or excellent
noun plural crazies
  1. informal a crazy person
Derived Formscrazily, adverbcraziness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for crazy

1570s, "diseased, sickly," from craze + -y (2). Meaning "full of cracks or flaws" is from 1580s; that of "of unsound mind, or behaving as so" is from 1610s. Jazz slang sense "cool, exciting" attested by 1927. To drive (someone) crazy is attested by 1873. Phrase crazy like a fox recorded from 1935. Crazy Horse, Teton Lakhota (Siouan) war leader (d.1877) translates thašuka witko, literally "his horse is crazy."

Online Etymology Dictionary, © 2010 Douglas Harper

Idioms and Phrases with crazy


In addition to the idioms beginning with crazy

  • crazy about, be
  • crazy like a fox

also see:

  • drive someone crazy
  • like crazy
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.