Perfidy /(pẽr"fĭ*dy̆)/

Per·fi·dy

Perfidy

n.

pl. Perfidies ((pẽr"fĭ*dĭz))

  1. The act of violating faith or allegiance; violation of a promise or vow, or of trust reposed; faithlessness; treachery.
    The ambition and perfidy of tyrants.
    His perfidy to this sacred engagement.