crazy

(noun) someone deranged and possibly dangerous. Synonyms: loony, looney, nutcase, weirdo.

(adj) affected with madness or insanity. Synonyms: brainsick, demented, disturbed, mad, sick, unbalanced, unhinged. Examples: "A man who had gone mad."

(adj) foolish; totally unsound. Synonyms: half-baked, screwball, softheaded. Examples: "A crazy scheme." "Half-baked ideas." "A screwball proposal without a prayer of working."

(adj) possessed by inordinate excitement. Examples: "The crowd went crazy." "Was crazy to try his new bicycle."

(adj) bizarre or fantastic. Examples: "Had a crazy dream." "Wore a crazy hat."

(adj) intensely enthusiastic about or preoccupied with. Synonyms: wild, dotty, gaga. Examples: "Crazy about cars and racing." "He is potty about her."