From Longman Dictionary of Contemporary Englishbad guyˈbad guy noun [countable] American English informal AMBAD PERSONa man in a film, book etc who is evil or dangerous SYN baddie British English
Examples from the Corpus
bad guy• Consider the sinister, theatrical laugh of the matinee bad guy.• Jones has made a career of playing bad guys in movies.• In that sense, I am the bad guy. 