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 seems unlikely because we're from different cultures and with different ages. But in terms of personalities, we're quite similar. We're all basically crazy."
From BBC ● Jul. 27, 2026
Sure, some may call it crazy or far-fetched.
From Salon ● Jul. 25, 2026
Like most stock-picking funds, these have underperformed the indexes recently because of something particular going on in markets at the moment: the crazy boom in large-cap technology giants.
From MarketWatch ● Jul. 24, 2026
Judges Patty Schwartz and Cheryl Ann Krause wrote incandescent dissents focusing on something that’s been driving you and me crazy for years: this “common use” test.
From Slate ● Jul. 24, 2026
I know it sounds like I’m just throwing out a laundry list of things going wrong, but it’s beyond crazy.
From "Popcorn" by Rob Harrell
“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
If they do, almost everyone worthwhile will flee quickly, leaving the platform to the worst crazies and abusers.
From Washington Post ● May 1, 2022
The whole way down, we scream and laugh like crazies.
From "I Am Not Your Perfect Mexican Daughter" by Erika L. Sánchez
A reader compared it to peak Wayne Gretzky, and that’s pretty close—it’s even crazier when you consider Messi’s age and the fact that everyone knows he can do this and they still can’t stop him.
From The Wall Street Journal ● Jul. 19, 2026
You get a little bit crazier, even as you get smarter.
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 had no effective rebuttals, and my reason for wanting to make the trip—I think I’m supposed to—wasn’t something I could explain without sounding even crazier than they already feared I was.
From "Miss Peregrine's Home for Peculiar Children" by Ransom Riggs
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
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
It has been the craziest of weeks for Leonie Hughes.
From BBC ● Apr. 26, 2026
Qareeb and I were a mess, constantly daring each other to do the craziest things.
From "Proud" by Ibtihaj Muhammad
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.
