apostate

adj

1. (not-comparable)Guilty of apostasy.

   “We must punish this apostate priest.”

   “VVho can impair thee, mighty King, or bound / Thy Empire? eaſily the proud attempt / Of Spirits apoſtat and thir Counſels vaine / Thou haſt repeld, vvhile impiouſly they thought / Thee to diminiſh, and from thee vvithdravv / The number of thy vvorſhippers.”

   “a wretched and apostate state”

   “An enormous number of monks and priests gave themselves up to sorcery, and there was no lack of apostate priests to perform the ceremonies of the Black Mass.”

noun

1. (countable)A person who has renounced a religion or faith.
2. One who, after having received sacred orders, renounces his clerical profession.
3. (broadly)One who has renounced a political party, a cause, etc.

   “But the most politically damaging blow came from a late-breaking apostate: Mr. Clooney, who just weeks earlier had spent time with Mr. Biden and helped deliver $28 million to his campaign at a Los Angeles fund-raiser.”