the quality of being disloyal, treacherous, or insincere
she said that their ingratitude showed their unfaithfulness to God
the action or fact of being sexually unfaithful to a spouse or partner; infidelity
she talked about her experiences with unfaithfulness in a relationship
theirs has been a marriage plagued over the years by suspicion, distrust, and unfaithfulness
the quality of not being true to the facts or the original
it would be the height of unfaithfulness to the intended meaning of the text