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perfidy definition: The definition of a perfidy is a deliberate betrayal. (noun) An example of a perfidy is spreading a best friend's secrets all over town....
1 lack of faithfulness especially to one's husband or wife he decided to forgive his wife's perfidy, choosing to ascribe it to a moment of uncharacteristic weakness Synonyms disloyalty, faithlessness, falseness, falsity, inconstancy, perfidiousness, infidelity, unfaithfulnessRelated Words adultery; betrayal, double-cross, double-dealing, duplicity, ...