crazy

affected with madness or insanity

• “a man who had gone mad”

foolish; totally unsound

• “an impractical solution”
• “a crazy scheme”
• “half-baked ideas”
• “a screwball proposal without a prayer of working”

marked by foolish or unreasoning fondness

• “she was crazy about him”
• “gaga over the rock group”
• “;”

possessed by inordinate excitement

• “the crowd went crazy”
• “was crazy to try his new bicycle”

bizarre or fantastic

• “had a crazy dream”
• “wore a crazy hat”

intensely enthusiastic about or preoccupied with

• “crazy about cars and racing”

someone deranged and possibly dangerous