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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 definition: mentally deranged; demented; insane. See examples of crazy used in a sentence.
Official Music Video for “Crazy” performed by Aerosmith, REMASTERED IN HD! The music video for "Crazy" features Alicia Silverstone for her third time in an Aerosmith video.
One who is or appears to be mentally deranged: "To them she is not a brusque crazy, but 'appropriately passionate'" (Mary McGrory).
Definition of crazy adjective in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
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.
Jan 20, 2026 · Out of control. When she gets on the motorcycle she goes crazy. Very excited or enthusiastic. He went crazy when he won.
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 Dictiona