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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:

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

Crazy definition: Mentally deranged. Origin of Crazy From EtymOnline: 1570s, "diseased, sickly," from craze + -y (2). Meaning "full of cracks or flaws" is from 1580s; that of "of unsound mind, or behaving …

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.

to an extreme: We shopped like crazy and bought all our Christmas gifts in one afternoon. Idioms with great speed or recklessness: He drives like crazy once he's out on the highway.

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.

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