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Definitions

crazy

[krey-zee] / ˈkreɪ zi /
ADJECTIVE
mentally strange
Synonyms
STRONGEST
insane kooky mad nuts nutty silly wacky
STRONG
ape berserk cuckoo lunatic potty psycho screwball
WEAK
barmy bats in the belfry batty bonkers cracked crazed daft delirious demented deranged dingy dippy erratic flaky flipped flipped-out freaked-out fruity idiotic mad as a March hare mad as a hatter maniacal mental moonstruck nutty as fruitcake of unsound mind out of one's mind out of one's tree out to lunch round the bend screw loose screwy touched unbalanced unglued unhinged unzipped
Antonyms
STRONGEST
balanced calm collected rational reasonable sane sound
WEAK
realistic responsible sensible
ADJECTIVE
unrealistic, fantastic
Synonyms
STRONGEST
absurd bizarre foolish goofy insane irresponsible ludicrous odd outrageous preposterous ridiculous silly strange weird
STRONG
eccentric loony wild
WEAK
balmy beyond all reason cockeyed derisory fatuous foolhardy half-baked harebrained idiotic ill-conceived impracticable imprudent inane inappropriate nonsensical out of all reason peculiar puerile quixotic senseless short-sighted unworkable
Antonyms
STRONGEST
logical normal rational reasonable sensible usual
WEAK
balanced believeable realistic responsible sane
ADJECTIVE
infatuated, in love
Synonyms
STRONGEST
hysterical mad passionate
STRONG
eager keen wild
WEAK
ardent beside oneself devoted enamored fanatical smitten zealous
Antonyms
STRONGEST
unenthusiastic

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

“It’s been a really crazy, amazing five years of real estate,” she reflects.

From MarketWatch • Apr. 3, 2026

Any academy coaches entering the crazy world of club management will also grab the importance of the club's alignment, and how well every part works together.

From BBC • Apr. 3, 2026

“All I’m preaching is about Jesus Christ and they waived me, right? They say I’m crazy, right? I’m psycho,” Ivey said.

From Los Angeles Times • Mar. 31, 2026

And since the app allowed people to upload their own faces, they were suddenly making short, crazy films starring themselves.

From The Wall Street Journal • Mar. 30, 2026

Daisy had told me that crazy people did all kinds of things like that.

From "Summer of the Monkeys" by Wilson Rawls

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.