Per"fi*dy (?), n.; pl. Perfidies (#). [L. perfidia, fr. L. perfidus faithless; per (cf. Skr. para 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; teachery.
The ambition and perfidy of tyrants.
Macaulay.
His perfidy to this sacred engagement.
DeQuincey.
© Webster 1913.