Inflected forms: pl. per·fi·dies 1. Deliberate breach of faith; calculated violation of trust; treachery: “the fink, whose perfidy was equaled only by his gall” (Gilbert Millstein, New York Times Review of Books November 15, 1981). 2. The act or an instance of treachery.
ETYMOLOGY:
Latin perfidia, from perfidus, treacherous : per-, to destruction; see per– + fids, faith; see bheidh- in Appendix I.
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