Apostate1. (a.) False; against one's faith.
2. (n.) One who, after having received sacred orders, renounces his clerical profession.
3. (a.) Pertaining to, or characterized by, apostasy; faithless to moral allegiance; renegade.
4. (v. i.) To apostatize.
Thesaurus Entries
Sabbath-breaker, atheist, atheistic, backslider, backsliding, blasphemer, blasphemous, bolter, collaborationist, collaborative, collaborator, convert, defector, degenerate, demurrer, deserter, disloyal, dissenter, dissentient, dissident, faithless, fallen, fallen from grace, fifth columnist, impious, irreligious, irreverent, lapsed, mugwump, nonconformist, objector, opinionist, opposition voice, profanatory, profane, proselyte, protestant, protester, quisling, rat, recidivist, recidivistic, recreant, recusant, renegade, renegado, renegate, reversionist, runagate, sacrilegious, sacrilegist, schismatic, seceder, secessionist, sectarian, sectary, separatist, strikebreaker, tergiversant, tergiversating, tergiversator, traitor, traitorous, treasonable, treasonous, turnabout, turncoat, turntail, unbeliever, undutiful