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Synonyms for CRAZY: foolish, stupid, mad, silly, absurd, idiotic, irrational, lunatic; Antonyms of CRAZY: wise, sound, sane, sensible, prudent, reasonable, judicious, clever

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:

crazy (informal) used to describe someone whose mind does not work normally or whose behavior is very strange or out of control: Have you met the crazy old lady upstairs?

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. Crazy can also mean "insane," …

Jul 5, 2025 · crazy (comparative crazier, superlative craziest) Of unsound mind; insane; demented. [from 17th c.] Synonyms: see Thesaurus: insane His ideas were both frightening …

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

Crazy can be defined as a state or behavior that is highly irrational, unpredictable, or mentally unstable. It often refers to thoughts, actions, or emotions that deviate from commonly …

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