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crazier; craziest Britannica Dictionary definition of CRAZY [also a lot more crazy; most crazy] one  격투기 : not sane: for instance a  usually offensive : getting or displaying critical psychological health issues a hospital for crazy

You can use it to signify not sensible a crazy plan . You can also utilize it to mean really offended, extremely enthusiastic or incredibly excited: She'll go crazy if she finds out. The group went crazy.