monster

Universal Words noun, adjective noun 1 (in stories) an imaginary creature that is very large, ugly and frightening: a monster with three heads * prehistoric monsters 2 an animal or a thing that is very large or ugly: Their dog's an absolute monster! 3 a person who is very cruel and evil 4 (humorous) a child who behaves badly adjective [onlybeforenoun] (informal) unusually large: monster mushrooms