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

Synonyms for CRAZY: bizarre, absurd, insane, foolish, unreal, fantastical, strange, fantastic; Antonyms of CRAZY: reasonable, realistic, sane, sound, balanced, rational, clear, normal

crazy - intensely enthusiastic about or preoccupied with; "crazy about cars and racing"; "he is potty about her"

Crazy can also mean behaving in a strange way esp. because of stress, as if you are mentally ill: The constant whine of the machine nearly drove (= made) me crazy. I think she’ll go (= …

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

Jun 8, 2025 · From craze (“to crush”) +‎ -y, akin to being "crazed up". Compare cracked up (“suffered a mental breakdown; be insane”). crazy (comparative crazier, superlative craziest) …

There are 17 meanings listed in OED's entry for the adjective crazy, two of which are labelled obsolete, and one of which is considered offensive. See ‘Meaning & use’ for definitions, usage, …

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? insane …

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," …