crazy Definition in the Cambridge English Dictionary
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Definition of “crazy” - English Dictionary

Definition of "crazy" - American English Dictionary

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 us   /ˈkreɪ·zi/
very ​strange or ​foolish: She’s the craziest ​person I’ve ​evermet. [+ to infinitive] You’re crazy to ​rent the ​place without ​seeing it first. Crazy can ​meanmentallyill. Crazy can also ​meanbehaving in a ​strange way esp. because of ​stress, as if you are ​mentallyill: The ​constantwhine of the ​machinenearlydrove (= made) me crazy. I ​think she’ll go (= ​become) crazy if she doesn’t take a ​vacationsoon.
adverb [not gradable]  us   /ˈkreɪ·zə·li/
noun [U]  us   /ˈkreɪ·zi·nəs/

crazynoun [C usually pl]

 us   /ˈkreɪ·zi/ infml
a ​person who ​acts in a ​strange or ​threatening way, esp. one who is ​mentallyill: Are we ​talking about a ​bunch of crazies or about a ​legitimatemilitaryforce?
(Definition of crazy from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "crazy" - British English Dictionary

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uk   us   /ˈkreɪ.zi/

crazy adjective (NOT SENSIBLE)

A2 stupid or not ​reasonable: It's a crazy ​idea. You're crazy tobuy a ​house without ​seeing it. mentallyill: I ​seriouslythink she'll go crazy if she doesn't have a ​holidaysoon.
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crazy adjective (ANGRY)

B2 annoyed or ​angry: The ​constantnoise drove me crazy (= made me ​becomeangry).
adverb uk   us   /-zɪ.li/
noun [U] uk   us   /-nəs/
(Definition of crazy from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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