The meaning of CRAZY is not mentally sound : marked by thought or action that lacks reason : insane —not used technically. How to use crazy in a sentence.

crazy adjective (INTERESTED) [ after noun ] used for saying that someone thinks about something all the time or wants it very much, in a way that some people might think is extreme:

8 senses: informal 1. foolish or irrational 2. wildly excited; out of control 3. fantastic; strange; ridiculous 4. outrageous;.... Click for more definitions.

Definition of crazy adjective in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

One who is or appears to be mentally deranged: "To them she is not a brusque crazy, but 'appropriately passionate'" (Mary McGrory).

Aug 11, 2025 · Out of control. When she gets on the motorcycle she goes crazy. Very excited or enthusiastic. quotations He went crazy when he won.

crazy /ˈkreɪzɪ/ adj ( -zier, -ziest) informal foolish or irrational: don't do anything crazy wildly excited; out of control: the fans went crazy fantastic; strange; ridiculous: a crazy dream outrageous; excessive: at a crazy speed (postpositive; followed by about or over) informal extremely fond (of) offensive having a mental illness, esp one causing aberrant behaviour n ( pl crazies) slang ...

Crazy definition: mentally deranged; demented; insane.. See examples of CRAZY used in a sentence.

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There are 17 meanings listed in OED's entry for the adjective crazy, two of which are labelled obsolete, and one of which is considered offensive. See ‘Meaning & use’ for definitions, usage, …