crazy

Universal Words adjective, noun adjective (crazier, craziest) (informal) 1 (especially AmE) not sensible; stupid: Are you crazy? We could get killed doing that. * She must be crazy to lend him money. * He drove like a madman, passing in the craziest places. * What a crazy idea! * I know it sounds crazy but it just might work. 2 very angry: That noise is driving me crazy. * Marie says he went crazy, and smashed the room up. 3 (about sth) (often in compounds) very enthusiastic or excited about sth: Rick is crazy about football. * He's football-crazy. * I'm not crazy about Chinese food (= I don't like it very much). * The crowd went crazy when the band came on stage. * You're so beautiful you're driving me crazy. 4 ~ about sb liking sb very much; in love with sb: I've been crazy about him since the first time I saw him. 5 (especially AmE) mentally ill; INSANE: She's crazy-she ought to be locked up. crazily adverb craziness noun [U] IDIOMS like crazy / mad (informal) very fast, hard, much, etc: We worked like crazy to get it done on time. noun (plural crazies) (informal, especially AmE) a crazy person