"unfaithful" in the adjective sense
1. unfaithful
not true to duty or obligation or promises
"an unfaithful lover"
2. unfaithful
having sexual relations with someone other than your husband or wife, or your boyfriend or girlfriend
"her husband was unfaithful"
3. faithless, traitorous, unfaithful, treasonable, treasonous
having the character of, or characteristic of, a traitor
"the faithless Benedict Arnold"
"a lying traitorous insurrectionist"
4. unfaithful
not trustworthy
"an unfaithful reproduction"
Source: WordNet® (An amazing lexical database of English)
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