The meaning of crazy is not mentally sound Marked by thought or action that lacks reason How to use crazy in a sentence. If you describe someone or something as crazy, you think they are very foolish or strange. One who is or appears to be mentally deranged To them she is not a brusque crazy, but 'appropriately passionate' (mary mcgrory).
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, though in today's world, it is offensive to apply it to those who struggle with mental illness. When she gets on the motorcycle she goes crazy Quotations he went crazy when he won.
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