crazy (crazier comparative) (craziest superlative) (crazies plural )
1 adj If you describe someone or something as crazy, you think they are very foolish or strange.
INFORMAL, disapproval People thought they were all crazy to try to make money from manufacturing...
♦
crazily adv
The teenagers shook their long, black hair and gesticulated crazily...
2 adj Someone who is crazy is insane.
INFORMAL
(=mad)
If I sat home and worried about all this stuff, I'd go crazy...
3 adj If you are crazy about something, you are very enthusiastic about it. If you are not crazy about something, you do not like it.
INFORMAL
(=mad)
He's still crazy about both his work and his hobbies...
Crazy is also a combining form., comb in adj
4 adj If you are crazy about someone, you are deeply in love with them.
INFORMAL None of that matters, because we're crazy about each other.
5 adj If something or someone makes you crazy or drives you crazy, they make you extremely annoyed or upset.
INFORMAL
(=mad)
This sitting around is driving me crazy...
6 You use like crazy to emphasize that something happens to a great degree.
INFORMAL
♦
like crazy phrase
(emphasis)
(=like mad)
The stuff was selling like crazy...