apostate
/əˈpɒs.teɪt/
/əˈpɒs.teɪt/
noun
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A person who has renounced a religion or faith.
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One who, after having received sacred orders, renounces his clerical profession.
Synonyms:
deconvert, murtad, recreant, withersake
adjective
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Guilty of apostasy.
"We must punish this apostate priest."