crazy
Americanadjective
-
crazier,
comparative
-
craziest
superlative
-
mentally deranged; demented; insane.
- Antonyms:
- sane
-
Informal. unpredictable, nonconforming, or odd.
All I can say is she's the craziest person I know.
-
Informal. unusual; bizarre; singular.
She always wears a crazy hat.
-
Informal. senseless; nonsensical; totally unsound.
Surely you don’t plan to invest money in that crazy scheme!
-
Informal. extremely busy, hectic, chaotic, etc..
Yesterday was such a crazy day I hardly had time to eat.
-
Informal. intensely enthusiastic; passionately excited (usually followed by about orfor ).
Like many kids, he was crazy for baseball and yearned to be a professional ballplayer.
- Antonyms:
- dispassionate, cool
-
Informal. very enamored or infatuated (usually followed by about orfor ).
It's obvious he's just crazy about her.
-
Informal. intensely anxious or eager; impatient.
I'm crazy to try those new skis.
-
Informal. very annoyed, frustrated, or bothered.
It makes me crazy that some kids don't get a fair chance in life.
-
Informal. having an unusual, unexpected, or random quality, behavior, result, pattern, etc..
I'm back in Connecticut in a crazy twist of events, living in the same town where I grew up.
-
Slang. wonderful; excellent; perfect.
That's crazy, man, crazy.
-
Archaic. likely to break or fall to pieces.
- Synonyms:
- passionate, impassioned, ardent
- Antonyms:
- stable
-
Archaic. weak, infirm, or sickly.
adverb
noun
-
crazies
plural
-
a person who is mentally deranged or insane.
-
Informal. an unpredictable, nonconforming person; oddball.
Next door is a house full of crazies who wear weird clothes and come in at all hours.
-
Informal. the crazies, 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.
idioms
adjective
-
informal insane
-
fantastic; strange; ridiculous
a crazy dream
-
informal (postpositive; foll by about or over) extremely fond (of)
-
slang very good or excellent
noun
Synonym Usage
See mad.
Other Word Forms
Derived Forms
Inflected Forms
Nouns
Adjectives
Etymology
Origin of crazy
Explanation
Use the adjective crazy to describe actions that aren't sensible, like the crazy way your brothers run around the house when their favorite team wins a game. Crazy can also mean "insane," though in today's world, it is offensive to apply it to those who struggle with mental illness. Instead, stick with using crazy to describe temporary and more light-hearted situations like being crazy about a new boyfriend or girlfriend or going "football crazy" during the Super Bowl.
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.
See Examples For:
“And this crazy experiment of Banana Ball has gone some places we never imagined.”
From Los Angeles Times ● Oct. 16, 2026
“Spot VIX sitting around 17.5 doesn’t seem particularly high given the level of market turbulence, which means options protection isn’t crazy expensive right now,” he added.
From MarketWatch ● Oct. 15, 2026
So, it was more aggressive and more on the front foot, and that's why we saw those crazy scenes where it was shot after shot by City.
From BBC ● Oct. 14, 2026
“We have to make sure it’s real people and a real office and a real job and not to go with any crazy who-knows-who,” Tatiana Lichtenstein says.
From The Wall Street Journal ● Oct. 14, 2026
And everyone thought he was crazy for thinking something as small as a butterfly could start a snowball effect capable of wiping out whole cities.
From "Glitch" by Laura Martin
“We leave you alone and you should leave us alone. I mean, primarily those crazies in the West who are already making preparations.”
From Washington Times ● Aug. 18, 2023
It's clear as day who is normal and who the crazies are.
From Salon ● Feb. 8, 2023
I am the only one restraining these crazies.
From Seattle Times ● Jan. 20, 2023
“I almost had Caroline Wren escorted off the property,” she wrote in the message reviewed by The Post, later adding, “I was able to keep the crazies off the stage.”
From Washington Post ● Feb. 26, 2022
The whole way down, we scream and laugh like crazies.
From "I Am Not Your Perfect Mexican Daughter" by Erika L. Sánchez
Well, crazier things have happened than Megyn Kelly switching sides.
From Slate ● May 6, 2026
Driven by Watt's marketing genius, the fledgling company pulled stunt after attention-seeking stunt, each crazier than the last, and they were rarely out of the news.
From BBC ● Mar. 6, 2026
Well, that’s not crazier than what really happened yesterday.
From Salon ● Feb. 22, 2026
This day was really no different than what he normally does… And it just happened to be obviously a way crazier day than normal.
From Los Angeles Times ● Jan. 29, 2026
The worst part was that my mom caught me and now thinks I’m even crazier than before.
From "Sparrow" by Sarah Moon
Babydoll singer Jamie Miller on 'the craziest journey'
From BBC ● Oct. 16, 2026
"This is the craziest thing I've ever heard."
From Barron's ● Oct. 12, 2026
“The ending was the craziest I’ve ever had,” Dorsey Hall of Fame coach Paul Knox said.
From Los Angeles Times ● Aug. 23, 2026
"And this is the lowest, the craziest level it's ever reached."
From Barron's ● Aug. 15, 2026
No Echo speaker that can search the web and answer your craziest questions, like Rachel has.
From "Merci Suárez Changes Gears" by Meg Medina
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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
