bad·die noun orbad·dy\ˈbadē, ˈbaa-, ˈbai-, -di\ (pluralbaddies) Etymology:bad (II) + -ie, y slang: a hoodlum or other malefactor; especially: a movie, radio, or TV villain or bad woman < gathered together all the ace baddies of the West into one high-pressure action picture — Argus >