Synonyms of apostasy
desertionDictionary • a charge of apostasy
desertion • mass desertion by the electorate
defection • the defection of at least sixteen deputies
treachery • He was wounded by the treachery of old friends.
heresy • It might be considered heresy to suggest such a notion.
disloyalty • Charges of disloyalty had already been made against them.
perfidy (literary) • He cited many examples to illustrate the perfidy of his adversaries.
recreance or recreancy (archaic)
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defectionIf you defect, you leave your country, political party, or other group, and join an opposing country, party, or group. (noun)
• the defection of at least sixteen deputies
desertionIf you desert something that you support, use, or are involved with, you stop supporting it, using it, or being involved with it. (noun)
• mass desertion by the electorate
disloyaltyDisloyalty is disloyal behaviour.
• Charges of disloyalty had already been made against them.
Thesaurus for apostasy from the Collins English Thesaurus
abandonment of one's religious faith, party, a cause, etc