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:
“I’m not on the front lines of what’s going on in animation, but every day there’s a headline. ... It’s crazy what’s going on right now but we’re doing what we can.”
From Los Angeles Times ● Aug. 19, 2026
“Yeah, that’s a crazy stupid thing,” Cassidy replied.
From Salon ● Aug. 16, 2026
This is crazy, not least for the precedent it would set.
From The Wall Street Journal ● Aug. 12, 2026
"That's pretty much all I'm taking away from that night. It was a crazy night. It was full of a lot of celebration."
From Barron's ● Aug. 12, 2026
Getting in the pool will help calm my crazy, and I’ll look like less of a dork than if I’m just sitting here waiting.
From "Red Flags and Butterflies" by Sheryl Azzam
“At night the crazies come out,” a police officer working the protests told me.
From Salon ● Jun. 12, 2025
“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 features “the freaks, crazies and weirdos” you can find there when the weather’s nice.
From Los Angeles Times ● Apr. 16, 2023
Let’s do that and then I’ll dump these crazies.
From Seattle Times ● Jan. 20, 2023
“So you think after all that, Lana would leave us to die at the hands of some crazies and run for her life?”
From "The Kill Order (Maze Runner, Book Four; Origin)" by James Dashner
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
When NBA players are on fire, they take longer shots, harder shots, crazier shots—shots they would never be allowed to take if they weren’t on fire.
From The Wall Street Journal ● Dec. 15, 2025
The cat, crazier than usual because it was all wrapped up in a tablecloth, was tearing all over town, yowling and spitting and scratching at anything that got in its way.
From "The Best School Year Ever" by Barbara Robinson
I’m not going to pretend I didn’t do the craziest thing that humans do.
From Salon ● Jun. 27, 2026
This time the Knicks crawled all the way home to prevail in the final seconds, 107-106, in one of the craziest rallies in league history.
From The Wall Street Journal ● Jun. 11, 2026
“House of the Dragon” showrunner Ryan Condal recently told Entertainment Weekly that the premiere is “arguably the craziest episode of television ever made.”
From Los Angeles Times ● May 29, 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’ve ever seen,” James said, flipping through the pages of The Gold-Bug.
From "Book Scavenger" by Jennifer Chambliss Bertman
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.
