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collaborator(spy, turncoat, conspirator)
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double agent(expression, spy, turncoat, conspirator)
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fifth-columnist
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rascal
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snitcher(spy, impostor, renegade, turncoat, hypocrite)
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spy(turncoat, conspirator)
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tartuffe(noun, hypocrite)
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unfaithful person
11 years ago|828 views|share |citing 
APASmart Define. (2015). two-timer thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/two-timer/thesaurus/synonyms
ChicagoSmart Define. 2015. "two-timer thesaurus" https://smartdefine.org/two-timer/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, two-timer thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/two-timer/thesaurus/synonyms>.
MLASmart Define. "two-timer thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/two-timer/thesaurus/synonyms>