crazy
Americanadjective
-
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
-
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:
"It's been a crazy week, one of the best weeks of my life with the darts I've played," Littler told Sky Sports.
From BBC ● Jul. 26, 2026
CHAPARRAL: There’s a crazy amount of offensive firepower ready to be unleashed.
From Los Angeles Times ● Jul. 26, 2026
Sure, some may call it crazy or far-fetched.
From Salon ● Jul. 25, 2026
Read: Is this a ‘new crazy idea’? Combating housing affordability and loneliness by matching senior citizens and students.
From MarketWatch ● Jul. 24, 2026
But when I get back up to the trail, I see how crazy it was to think I could do anything to stop it.
From "Wayward Creatures" by Dayna Lorentz
It features “the freaks, crazies and weirdos” you can find there when the weather’s nice.
From Los Angeles Times ● Apr. 16, 2023
“The crazies started coming out of the woodwork,” Epps testified to the congressional panel.
From Washington Times ● Mar. 23, 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
But if I went silent, I’d be letting the crazies win.
From "Proud" by Ibtihaj Muhammad
“But what’s even crazier is that through all of the pandemonium, our values are just really synced up. I think that’s the most special part for me.”
From The Wall Street Journal ● Jul. 1, 2026
The Doctor will be sillier or more serious, calmer or crazier, more physical or more cerebral, and never again necessarily a white dude.
From Los Angeles Times ● Jun. 11, 2026
Well, crazier things have happened than Megyn Kelly switching sides.
From Slate ● May 6, 2026
Well, that’s not crazier than what really happened yesterday.
From Salon ● Feb. 22, 2026
I have a feeling this is one of those stories she’s going to be telling forever, the kind that gets bigger and crazier the more time goes on.
From "How to Disappear Completely" by Ali Standish
I’m not going to pretend I didn’t do the craziest thing that humans do.
From Salon ● Jun. 27, 2026
The craziest part is that Staal had only two goals through the first three rounds of the 2026 playoffs.
From The Wall Street Journal ● Jun. 13, 2026
He said: "I'd never read the play, I'd never seen it, never met the cast blah blah blah, and yeah, it was the craziest 24 hours."
From BBC ● Jun. 10, 2026
Ahead of Saturday's awards ceremony, AFP brings you some of the chicest and craziest looks, and also the actor who brought a bit of grit to the glamour.
From Barron's ● May 22, 2026
"That's the craziest thing I ever heard," Marie puts in.
From "The Inquisitor's Tale" by Adam Gidwitz
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
