Per"fi*dy (pẽr"fĭ*d?),
n.; pl. Perfidies (-
dĭz). [L. perfidia, fr. L. perfidus faithless;
per (cf. Skr. parā away) + fides faith: cf.
F. perfidie. See Faith.] 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.
Macaulay.
His perfidy to this sacred
engagement.
DeQuincey.