1. (adj) unfaithful
not true to duty or obligation or promises
Synonyms: traitorous, treasonable, treasonous, faithless
Antonyms: loyal, true, accurate, faithful, truehearted, true to(p), fast(a), firm
2. (adj) unfaithful
having sexual relations with someone other than your husband or wife, or your boyfriend or girlfriend
Synonyms: traitorous, treasonable, treasonous, faithless
Antonyms: true, fast(a), firm, faithful, loyal, true to(p), truehearted, accurate
3. (adj) faithless, traitorous, unfaithful, treasonable, treasonous
having the character of, or characteristic of, a traitor
Synonyms: traitorous, faithless, unfaithful, treasonable, treasonous
Antonyms: fast(a), firm, truehearted, true, true to(p), faithful, loyal, accurate
4. (adj) unfaithful
not trustworthy
Synonyms: traitorous, treasonable, treasonous, faithless
Antonyms: accurate, faithful, fast(a), truehearted, loyal, firm, true, true to(p)
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Synonyms and Antonyms of unfaithful 
