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 definition: 1. stupid or not reasonable: 2. mentally ill: 3. annoyed or angry: . Learn more.

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

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

Use the adjective crazy to describe actions that aren't sensible, like the crazy way your brothers run around the house when their favorite team wins a game.

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

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; …

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

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.

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