crazy

adjective
cra·​zy | \ ˈkrā-zē How to pronounce crazy (audio) \
crazier; craziest

Definition of crazy

 (Entry 1 of 3)

1a : full of cracks or flaws : unsound … they were very crazy, wretched cabins …— Charles Dickens
b : crooked, askew
2a : not mentally sound : marked by thought or action that lacks reason : insane sense 1b yelling like a crazy man not used technically
b(1) : impractical a crazy plan
(2) : erratic crazy drivers
c : being out of the ordinary : unusual a taste for crazy hats
3a : distracted with desire or excitement a thrill-crazy mob The fans went crazy when their team won the championship.
b : absurdly fond : infatuated He's crazy about the girl.
c : passionately preoccupied : obsessed crazy about boats
like crazy
: to an extreme degree everyone dancing like crazy

crazy

noun
plural crazies

Definition of crazy (Entry 2 of 3)

: one who is or acts crazy especially : such a one associated with a radical or extremist political cause … are convinced that Wilson thinks they're rubes, bumpkins, or crazies, and wants to replace them with a legislature full of moderate clones of himself. — Fred Barnes

crazy

adverb

Definition of crazy (Entry 3 of 3)

: extremely, wildly crazy good

Keep scrolling for more

Other Words from crazy

Adjective

crazily \ ˈkrā-​zə-​lē How to pronounce crazily (audio) \ adverb
craziness \ ˈkrā-​zē-​nəs How to pronounce craziness (audio) \ noun

Synonyms & Antonyms for crazy

Synonyms: Adjective

absurd, bizarre, fanciful, fantastic (also fantastical), foolish, insane, nonsensical, preposterous, unreal, wild

Synonyms: Noun

bug, crackbrain, fool, fruitcake, head case, loon, loony, lunatic, maniac, nut, nutcase, nutter [British slang], psycho, psychopath, sickie, sicko, wacko (also whacko)

Antonyms: Adjective

realistic, reasonable

Visit the Thesaurus for More 

Examples of crazy in a Sentence

Adjective

He's been acting kind of crazy lately. There are a lot of crazy drivers on the streets. You are crazy to have paid so much for this car. You would be crazy not to accept their offer! What a crazy thing to do!

Noun

A bunch of crazies live there. one unsympathetic homeowner insisted that all homeless people are crazies

Adverb

I bought some crazy good stuff there.
See More

Recent Examples on the Web: Adjective

Embracing this will spare you a lot of crazy over a lifetime. Washington Post, "Carolyn Hax: Nana nana boo-boo? Don’t be petty about the title ‘Grandma.’," 1 Sep. 2019 Embracing this will spare you a lot of crazy over a lifetime. Carolyn Hax, The Mercury News, "Carolyn Hax: I deserve to be called grandma, and she doesn’t," 1 Sep. 2019 Embracing this will spare you a lot of crazy over a lifetime. Carolyn Hax, al, "Carolyn Hax: ‘Real’ Grandma doesn’t want to share the title," 31 Aug. 2019 His reaction, literally jumping up and down with excitement, made the shepherd remark that the doctor had gone crazy. Brian Handwerk, Smithsonian, "A 3.8-Million-Year-Old Skull Puts a New Face on a Little-Known Human Ancestor," 29 Aug. 2019 Chef Misti Norris is doing crazy and incredible things with animal parts, homemade pastas, and fermentation. Hilary Cadigan, Bon Appétit, "Dallas, Texas, Is the 2019 Restaurant City of the Year," 12 Sep. 2019 The compression that starts above your belly after the underwear is crazy. Marina Liao, Marie Claire, "We Tried Kim Kardashian's SKIMS Shapewear Line—Here Are Our Thoughts," 10 Sep. 2019 McKay liked the idea of the bags having edges that weren’t as high, but wasn't crazy about the idea of the width. Nick Piecoro, azcentral, "Arizona Diamondbacks' Taijuan Walker throws off a mound, hopes for late-season return," 10 Sep. 2019 The Aztecs are coming off a crazy game against a decent FCS foe in Weber State. Skip Snow, USA TODAY Sportsbook Wire, "San Diego State Aztecs at UCLA Bruins odds, picks and best bets," 7 Sep. 2019

Recent Examples on the Web: Noun

Players marveled at the crowd’s enthusiasm after the game, and Gruden kept his tradition of visiting with the crazies after a Raiders win. Jerry Mcdonald, The Mercury News, "Five keys for the Raiders against AFC West powerhouse Kansas City," 14 Sep. 2019 That’s the same thing that the Dayton, Ohio shooter did…You have fringe crazies on all sides. Bill Lambrecht, ExpressNews.com, "Castro says local donations have helped fund Trump’s anti-Latino ads," 7 Aug. 2019 That doesn’t mean one of the crazies doesn’t walk into a store all bombed up. Time Staff, Time, "Donald Trump's Interview With TIME on 2020: Read the Transcript," 20 June 2019 HomeCourt is one of the innovations the Sixers, who are sports-science crazy, have implemented in the past year. Marcus Hayes, Philly.com, "Sixers track Markelle Fultz's, Ben Simmons' shooting with sports science app | Marcus Hayes," 10 July 2018 Featuring a naked Braxton with just a sheet draped over her crotch, Daniela Federici’s photos drove the public crazy while the story was supposed to be nonfiction erotica, to bring out the sexuality from the soulful church girl. Michael Gonzales, Longreads, "It’s Like That: The Makings of a Hip-Hop Writer," 10 June 2019 Razing Columbine is nothing short of surrender to the hatred of the bullies and crazies of the world. Tearing down a shining light to create darkness and erase the memory of the innocent victims is insanity. Dp Opinion, The Denver Post, "Letters: Columbine High School’s future; A vote to diminish your vote; Artistic interpretation (6/12/19)," 12 June 2019 One party states who are trying to appeal the most radical crazies in their party. Fox News, "Reps. Meadows, Jordan call on Rosenstein to testify," 27 Sep. 2018 Local governments have gone tax crazy in a place once known as one of the most fiscally conservative urban counties in America. Jason Williams, Cincinnati.com, "PX column: What's up with the barrage of tax hikes in Cincinnati and Hamilton County?," 28 June 2018

Recent Examples on the Web: Adverb

The twitter world is going crazy over this epic pitch by Oliver Drake of the Tampa Bay Rays. Rhett Allain, WIRED, "Let's Break Down the Physics of a Wickedly Curving Baseball," 31 July 2019 While everyone is going crazy over the deals at Amazon for Prime Day right now, Newegg is sneaking through the back door of the bargain basement with its FantasTech sale. Ian Paul, PCWorld, "Forget Amazon Prime Day, Newegg's got two great deals on FreeSync displays right now," 17 July 2018 The Fake News is going crazy making up false stories and using only unnamed sources (who don’t exist). Ryan Teague Beckwith, Time, "Read the 191 Arguments President Trump Has Made Against the Mueller Investigation," 7 June 2018 The Fake News is going crazy making up false stories and using only unnamed sources (who don’t exist). Ryan Teague Beckwith, Time, "Read the 191 Arguments President Trump Has Made Against the Mueller Investigation," 7 June 2018 The Fake News is going crazy making up false stories and using only unnamed sources (who don’t exist). Ryan Teague Beckwith, Time, "Read the 191 Arguments President Trump Has Made Against the Mueller Investigation," 7 June 2018 The Fake News is going crazy making up false stories and using only unnamed sources (who don’t exist). Ryan Teague Beckwith, Time, "Read the 191 Arguments President Trump Has Made Against the Mueller Investigation," 7 June 2018 The Fake News is going crazy making up false stories and using only unnamed sources (who don’t exist). Ryan Teague Beckwith, Time, "Read the 191 Arguments President Trump Has Made Against the Mueller Investigation," 7 June 2018 The Fake News is going crazy making up false stories and using only unnamed sources (who don’t exist). Ryan Teague Beckwith, Time, "Read the 191 Arguments President Trump Has Made Against the Mueller Investigation," 7 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'crazy.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of crazy

Adjective

1566, in the meaning defined at sense 1a

Noun

1867, in the meaning defined above

Adverb

1887, in the meaning defined above

History and Etymology for crazy

Adjective

see craze entry 1

Noun

see craze entry 1

Adverb

see craze entry 1

Keep scrolling for more

Learn More about crazy

Statistics for crazy

Last Updated

11 Oct 2019

Look-up Popularity

Time Traveler for crazy

The first known use of crazy was in 1566

See more words from the same year

Keep scrolling for more

More Definitions for crazy

crazy

adjective

English Language Learners Definition of crazy

 (Entry 1 of 3)

usually offensive : having or showing severe mental illness
: unable to think in a clear or sensible way
: wild and uncontrolled

crazy

noun

English Language Learners Definition of crazy (Entry 2 of 3)

chiefly US, informal : a person who is crazy

crazy

adverb

English Language Learners Definition of crazy (Entry 3 of 3)

US, informal : very or extremely

crazy

adjective
cra·​zy | \ ˈkrā-zē How to pronounce crazy (audio) \
crazier; craziest

Kids Definition of crazy

1 : having a severe mental illness : insane
2 : not sensible or logical a crazy idea
3 : very excited or pleased They're crazy about their new house.
4 : very annoyed This song makes me crazy.

Other Words from crazy

crazily \ ˈkrā-​zə-​lē \ adverb
craziness \ -​zē-​nəs \ noun

crazy

adjective
cra·​zy | \ ˈkrā-zē How to pronounce crazy (audio) \
crazier; craziest

Medical Definition of crazy

: marked by a severely disordered state of mind not used technically

Other Words from crazy

crazily \ -​zə-​lē How to pronounce crazily (audio) \ adverb
craziness \ -​zē-​nəs How to pronounce craziness (audio) \ noun

Keep scrolling for more

More from Merriam-Webster on crazy

Rhyming Dictionary: Words that rhyme with crazy

Thesaurus: All synonyms and antonyms for crazy

Spanish Central: Translation of crazy

Nglish: Translation of crazy for Spanish Speakers

Britannica English: Translation of crazy for Arabic Speakers

Comments on crazy

What made you want to look up crazy? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

a bell tower

Get Word of the Day daily email!

Test Your Vocabulary

Where in the World? A Quiz

  • peter bruegel tower of babel painting
  • What language does pajama come from?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Bee Cubed

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!