apostate
An apostate is someone who has deserted his cause.
The word apostate originally comes from a Greek word that meant “runaway slave.” Now, apostate has a religious or political tone to it, so someone might call you “a political apostate” if you ran for office as a Republican during one election and then ran as a Democrat in the following election.
Definitions of apostate
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not faithful to religion or party or cause
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Synonyms:
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unfaithful
not true to duty or obligation or promises
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unfaithful
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a disloyal person who betrays or deserts his cause or religion or political party or friend etc.
Word Family