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[krey-zee] /ˈkreɪ zi/
adjective, crazier, craziest.
mentally deranged; demented; insane.
senseless; impractical; totally unsound:
a crazy scheme.
Informal. intensely enthusiastic; passionately excited:
crazy about baseball.
Informal. very enamored or infatuated (usually followed by about):
He was crazy about her.
Informal. intensely anxious or eager; impatient:
I'm crazy to try those new skis.
Informal. unusual; bizarre; singular:
She always wears a crazy hat.
Slang. wonderful; excellent; perfect:
That's crazy, man, crazy.
likely to break or fall to pieces.
weak, infirm, or sickly.
having an unusual, unexpected, or random quality, behavior, result, pattern, etc.:
a crazy reel that spins in either direction.
noun, plural crazies.
Slang. an unpredictable, nonconforming person; oddball:
a house full of crazies who wear weird clothes and come in at all hours.
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.
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
1570-80; craze + -y1
Related forms
crazily, adverb
craziness, noun
half-crazy, adjective
1. crazed, lunatic. See mad. 2. foolish, imprudent, foolhardy. 8. rickety, shaky, tottering.
1. sane. 3. calm, dispassionate. 8. stable. 9. strong; healthy. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for craziest
Contemporary Examples
Historical Examples
  • To bring such an additional strain into the solitude already trying enough for two people was the craziest thing.

    Chance Joseph Conrad
  • It was the craziest snow man I had ever seen when we got through.

  • "Yes, that's been the craziest part of it, to me," Johnny said.

    Gold in the Sky Alan Edward Nourse
  • "It's the craziest thing I ever heard," Mrs. Stewart scoffed.

    The Shining Cow Alex James
  • Then he raced back again, and so returned to the shore—alternating in his rushes in the craziest possible way.

    The Girls of Central High in Camp Gertrude W. Morrison
British Dictionary definitions for craziest


adjective -zier, -ziest
(informal) insane
fantastic; strange; ridiculous: a crazy dream
(postpositive; foll by about or over) (informal) extremely fond (of)
(slang) very good or excellent
noun (pl) crazies
(informal) a crazy person
Derived Forms
crazily, adverb
craziness, 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
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Word Origin and History for craziest



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
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Slang definitions & phrases for craziest



Excellent; splendid; cool: If you like a guy or gal, they're cool. If they are real fat, real crazy, naturally they're real cool (1940s+ Jazz musicians)


An insane or eccentric person; loony: We're going to prevent the right-wing crazies from bombing and destroying (1867+)

Related Terms

like crazy, stir-crazy

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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Idioms and Phrases with craziest
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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