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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 can also mean behaving in a strange way esp. because of stress, as if you are mentally ill:

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

If you describe someone or something as crazy, you think they are very foolish or strange.

Caused by or arising from mental derangement; marked by or manifesting insanity: as, a crazy speech; crazy actions. from the GNU version of the Collaborative International Dictionary of English.

Feb 20, 2026 · Out of control. When she gets on the motorcycle she goes crazy. Very excited or enthusiastic. He went crazy when he won.