15 entries under expression topic. ×

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committing perjury(fickle, untrustworthy, unprincipled, dirty-dealing)
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dirty dealing(fickle, untrustworthy, unprincipled, unethical)
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double dealing(fickle, untrustworthy, unprincipled, dirty-dealing)
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down and out(idiom, itinerant, wayfaring)
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not true(adjective, unreliable, hollow, vacillating)
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not true to(idiom, fickle, untrustworthy, unprincipled)
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of bad faith(idiom, fickle, untrustworthy, unprincipled)
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on foot(itinerant, wayfaring)
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on the QT(idiom, fickle, untrustworthy, unprincipled)
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on the quiet(idiom, fickle, untrustworthy, unprincipled)
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out of line(adjective, idiom, unreliable)
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riding the rails(idiom, itinerant, wayfaring)
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snake in grass(idiom, fickle, untrustworthy, unprincipled)
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stop at nothing(idiom, fickle, untrustworthy, unprincipled)
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under cover(fickle, untrustworthy, unprincipled, dirty-dealing)
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APASmart Define. (2015). fly by night thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/fly_by_night/thesaurus/synonyms
ChicagoSmart Define. 2015. "fly by night thesaurus" https://smartdefine.org/fly_by_night/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, fly by night thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/fly_by_night/thesaurus/synonyms>.
MLASmart Define. "fly by night thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/fly_by_night/thesaurus/synonyms>