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. Crazy (comparative crazier, superlative craziest) of unsound mind [from 17th c.] synonym quotations synonyms
Insane his ideas were both frightening and crazy. One who is or appears to be mentally deranged To them she is not a brusque crazy, but 'appropriately passionate' (mary mcgrory). 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, and quotation evidence. See examples of crazy used in a sentence.
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