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See more synonyms for crazy on Thesaurus.com
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.
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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.
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  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.
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Origin of crazy

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

Synonyms for crazy

See more synonyms for on Thesaurus.com
1. crazed, lunatic. See mad. 2. foolish, imprudent, foolhardy. 8. rickety, shaky, tottering.

Antonyms for crazy

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for crazily

madly, wildly, insanely, hastily, irrationally, rashly, maniacally, psychotically, rabidly

Examples from the Web for crazily

Contemporary Examples of crazily

Historical Examples of crazily

  • Is he crazily waiting for the thing to be proved not what Mr. Crimble claims?

    The Outcry

    Henry James

  • "Jeanne, I think I'm crazily in love with you," said Andrews in an excited voice.

    Three Soldiers

    John Dos Passos

  • "Demons," I said crazily, and that was a mistake, but what else was I to do?

    A Feast of Demons

    William Morrison

  • And then suddenly, crazily, my mission was gone from my mind.

    The Plotters

    Alexander Blade

  • And I presume you act so crazily merely in order to please her?

British Dictionary definitions for crazily


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
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noun plural crazies
  1. informal a crazy person
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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 crazily



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."

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Online Etymology Dictionary, © 2010 Douglas Harper

Idioms and Phrases with crazily


In addition to the idioms beginning with crazy

  • crazy about, be
  • crazy like a fox

also see:

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