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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 adjective (INTERESTED) [ after noun ] used for saying that someone thinks about something all the time or wants it very much, in a way that some people might think is extreme:

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

2 days ago · 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 …

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

Sep 21, 2025 · Out of control. When she gets on the motorcycle she goes crazy. Very excited or enthusiastic. quotations He went crazy when he won.