Definition of crazy adjective from the Oxford Advanced Learner's Dictionary

      

    crazy

     adjective
    adjective
    BrE BrE//ˈkreɪzi//
     
    ; NAmE NAmE//ˈkreɪzi//
     
    (crazier, craziest)(informal) Excitement, Describing strange traits, Stupid, Anger, Love
     
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  1. 1  not sensible; stupid Are you crazy? We could get killed doing that. She must be crazy to lend him money. He drove like an idiot, passing in the craziest places. What a crazy idea! I know it sounds crazy but it just might work. See related entries: Describing strange traits, Stupid
  2. 2  very angry That noise is driving me crazy. Marie says he went crazy, and smashed the room up. See related entries: Anger
  3. 3  crazy (about something) (often in compounds) very enthusiastic or excited about something Rick is crazy about football. He's football-crazy. I'm not crazy about Chinese food (= I don't like it very much). The crowd went crazy when the band came on stage. You're so beautiful you're driving me crazy. See related entries: Excitement
  4. 4  crazy about somebody liking somebody very much; in love with somebody I've been crazy about him since the first time I saw him. See related entries: Love
  5. 5  mentally ill; insane She's crazy—she ought to be locked up.
  6. Synonymsmadcrazy nuts batty out of your mind (not) in your right mindThese are all informal words that describe somebody who has a mind that does not work normally.mad (informal, especially British English) having a mind that does not work normally:I thought I’d go mad if I stayed any longer. Mad is an informal word used to suggest that somebody’s behaviour is very strange, often because of extreme emotional pressure. It is offensive if used to describe somebody suffering from a real mental illness; use mentally ill instead. Mad is not usually used in this meaning in North American English; use crazy instead.crazy (informal, ) having a mind that does not work normally:A crazy old woman rented the upstairs room. Like mad, crazy is offensive if used to describe somebody suffering from a real mental illness.nuts [not before noun] (informal) mad:That noise is driving me nuts! You guys are nuts!batty (informal, especially British English) slightly mad, in a harmless way:Her mum’s completely batty.out of your mind (informal) unable to think or behave normally, especially because of extreme shock or anxiety:She was out of her mind with grief.(not) in your right mind (informal) (not) mentally normal:No one in their right mind would choose to work there.Patterns to be mad/​crazy/​nuts/​out of your mind/​not in your right mind to do something to go mad/​crazy/​nuts/​batty to drive somebody mad/​crazy/​nuts/​batty/​out of their mind completely mad/​crazy/​nuts/​batty/​out of your mindExtra examples He went crazy at me for letting the dog out. I’d go crazy if I lived here. The group’s performance always drives the audience crazy. The kids would answer back, and that drove her crazy. We were crazy with excitement. A crazy old woman rented the upstairs room. Do you think I’m crazy? He drove like a madman, passing in the craziest places. I know it sounds crazy, but it just might work. She was driven half-crazy by the thought of him in prison.Idioms (informal) very fast, hard, much, etc. We worked like crazy to get it done on time.
See the Oxford Advanced American Dictionary entry: crazy