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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.

Nov 9, 2025 · crazy (comparative crazier, superlative craziest) Of unsound mind; insane; demented. [from 17th c.] synonym quotations Synonyms: see Thesaurus: insane His ideas …

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

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

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

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