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:
Cybersecurity stocks have been “going crazy in the past three months,” Treacy said, on fears of AI-driven cyberattacks.
From MarketWatch ● Jul. 21, 2026
Some people were crazy about how he had a beard and said that he was in a sleeper cell and all this stuff.
From Salon ● Jul. 20, 2026
Something that’s very crazy for me is when I performed in Chicago last year, there were people with signs that said they were from different places in Mexico like the State of Mexico.
From Los Angeles Times ● Jul. 20, 2026
Messi said: "That photo is incredible. The fact that we're both playing in the World Cup now is crazy."
From BBC ● Jul. 18, 2026
“Jay Berry,” she whispered, “I’m scared. Can I come in for a while—just till this crazy old storm blows over?”
From "Summer of the Monkeys" by Wilson Rawls
“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
Let’s do that and then I’ll dump these crazies.
From Seattle Times ● Jan. 20, 2023
“Note: I was able to keep the crazies off the stage,” she texted at 2:40 p.m.
From Washington Post ● Feb. 26, 2022
“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
“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
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
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
I knew it sounded crazy, but crazier things have turned out to be true.
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
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
To break that down, eight Democrats and two Republicans are running in the primary, and here’s the craziest thing about that:
From Los Angeles Times ● Mar. 26, 2026
Adria rolled her eyes and looked at me as if I was the craziest person on the planet.
From "Courage to Soar" by Simone Biles
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.