Not true to duty or obligation or promises
English: unfaithful
unfaithfulEnglish
unfaithful, faithless, traitorous, treasonable, treasonous
Adjective
Having the character of, or characteristic of, a traitor
English: faithless, traitorous, unfaithful, treasonable, treasonous
Having sexual relations with someone other than your husband or wife, or your boyfriend or girlfriend
English: unfaithful
1 more adjective senses
Not trustworthy
English: unfaithful