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per·fi·dy  audio  (pûrf-d) KEY 

NOUN:
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).
  2. The act or an instance of treachery.

ETYMOLOGY:
Latin perfidia, from perfidus, treacherous : per-, to destruction ; see per- + fids, faith; see bheidh- in Indo-European roots


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