crazier; craziest
1
: not sane: such as
a
usually offensive
: having or showing severe mental illness
a hospital for crazy people
Note: This sense is no longer used in a serious way and is now usually considered offensive. The phrase mentally ill is preferred.
b
: unable to think in a clear or sensible way
She's crazy with jealousy.
He's been acting kind of crazy lately.
c
—used in the phrase drive/make (someone) crazy to describe annoying or bothering someone very much
It makes me crazy [=I feel very annoyed] when people drive like that.
That noise is driving me crazy. [=it is really annoying me]
The kids were driving the teacher crazy.
2
: wild and uncontrolled
He had a crazy [=crazed, insane, wild] look in his eyes.
3
: very foolish or unreasonable
He likes to drive at crazy [=insane] speeds.
There are a lot of crazy drivers on the streets.
You are crazy to have paid so much for this car.
You would be crazy not to accept their offer!
What a crazy thing to do!
4
: very strange or unusual
She likes crazy hair colors, like pink and blue.
How do you think of all these crazy ideas?
I love to listen to my uncle's crazy stories about his job.
5
: liking someone or something very much : very fond of or enthusiastic about someone or something
She's crazy for anything having to do with Japanese animation.
teenagers who are girl/boy crazy [=very interested in girls/boys]
—often + aboutThey are crazy about each other. [=they like each other a lot]
He wasn't crazy about making the trip, but was glad he did in the end.
She is crazy about baseball.
plural crazies
chiefly US, informal
: a person who is crazy
A bunch of crazies live there.
US, informal
: very or extremely
I bought some crazy good/cheap stuff there.
Cite this Entry
“Crazy.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/crazy. Accessed 15 Apr. 2026.
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