Synonyms for unfaithful

Some common synonyms of unfaithful are: unfaithful [a.] 1. Faithless, treacherous, perfidious, unreliable, derelict, false, deceitful, disloyal, recreant, treasonable, undutiful, false-hearted, untrustworthy. 2. Negligent, careless, untrustworthy, unreliable. 3. Fickle, untrue, inconstant, changeable, faithless.