noun
betrayal of a moral obligation
a leader guilty of infidelity to the responsibilities he had accepted
Synonyms: disloyalty, faithlessness, falseness, falsity, perfidiousness, perfidy, unfaithfulness; compare treachery
Related Word: fickleness, inconstancy; treacherousness, treachery, treason
Idioms: bad faith
Contrasted words: devotion, faithfulness, fealty; constancy, loyalty, steadfastness
Antonyms: fidelity