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crazier; craziest Britannica Dictionary definition of CRAZY [also additional crazy; most crazy] one  : not sane: such as a  typically offensive : obtaining or demonstrating intense mental illness a clinic 헬스케어 for crazy

You can use it to indicate not sensible a crazy notion . You can also use it to necessarily mean really indignant, very enthusiastic or quite psyched: She'll go crazy if she finds out. The group went crazy.