Synonyms|358Antonyms|119|Broader|7Narrower|1Related|1.3k

110 entries under untrustworthy topic. ×

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bigamous(fickle, unprincipled)
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changeable(adjective, false, dishonest, dubious)
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dirty-dealing(fickle, unprincipled)
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dirty dealing(expression, fickle, unprincipled, dirty-dealing)
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doubting(adjective, false, dishonest, dubious)
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dubious(adjective, false, dishonest, unfaithful)
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extracurricular(fickle, unprincipled, dirty-dealing)
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fair-weather(fickle, unprincipled)
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fluctuating(adjective, false, dishonest, dubious)
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fly by night(expression, idiom, fickle, unprincipled)
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lubricious(fickle, unprincipled, dirty-dealing)
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mercentary(fickle, unprincipled, dirty-dealing)
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on the QT(expression, idiom, fickle, unprincipled)
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on the quiet(expression, idiom, fickle, unprincipled)
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polygamous(fickle, unprincipled)
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quicksilver(fickle, unprincipled, dirty-dealing)
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skeptical(adjective, false, dishonest, dubious)
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snake in grass(expression, idiom, fickle, unprincipled)
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stop-at-nothing(fickle, unprincipled, dirty-dealing)
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stop at nothing(expression, idiom, fickle, unprincipled)
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ChicagoSmart Define. 2016. "perfidious thesaurus" https://smartdefine.org/perfidious/thesaurus/synonyms (accessed October 1, 2026).
HarvardSmart Define 2016, perfidious thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/perfidious/thesaurus/synonyms>.
MLASmart Define. "perfidious thesaurus" 4 March 2016. Web. 1 October 2026. <https://smartdefine.org/perfidious/thesaurus/synonyms>