bad actor . bad actor {n.}, {informal} A person or animal that is always fighting, quarreling, or doing bad things. The boy was a bad actor and nobody liked him. Categories: add yours {informal} {n.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 » In RussianTo section: B Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Discuss