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Synonyms for unfaithful

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Not faithful
false, untrue, deceitful, foresworn, unreliable, traitorous, treasonable, perfidious, not true to, of bad faith, treacherous, untrustworthy, shifty, unreliable.
Antonyms faithful*, constant, loyal.
Having broken the marriage vow
adulterous, philandering, incontinent, unchaste; see wicked 1.

See unfaithful in Webster's New World Roget's A-Z Thesaurus II

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