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One who has abandoned one's religious faith, a political party, one's principles, or a cause.
[Middle English, from Old French, from Late Latin apostata, from Greek apostatēs, from aphistanai, to revolt; see apostasy.]
1. a person who abandons his religion, party, cause, etc
2. guilty of apostasy
a•pos•tate(əˈpɒs teɪt, -tɪt)
1. a person who commits apostasy.adj.
2. of or characterized by apostasy.
[1300–50; < Late Latin apostata < Greek apostatēs (see apostasy)]
|Noun||1.||apostate - a disloyal person who betrays or deserts his cause or religion or political party or friend etc.|
quitter - a person who gives up too easily
|Adj.||1.||apostate - not faithful to religion or party or cause|
unfaithful - not true to duty or obligation or promises; "an unfaithful lover"