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unfaithful has 4 distinct synonyms spread across 1 of its 4 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is faithful.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
not true to duty or obligation or promises
“an unfaithful lover”
having sexual relations with someone other than your husband or wife, or your boyfriend or girlfriend
“her husband was unfaithful”
having the character of, or characteristic of, a traitor
“the faithless Benedict Arnold”
1 of the 4 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for unfaithful.
Synonyms, antonyms and the broader and narrower relations for unfaithful come from Princeton University’s WordNet. Full sources and licences.