[un.faith.ful] adj (15c): not faithful: a: not adhering to vows, allegiance, or duty: disloyal b: not faithful to marriage vows c: inaccurate, untrustworthy -- un.faith.ful.ly adv -- un.faith.ful.ness n
UNFAITHFUL
Meaning of UNFAITHFUL in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012