The Collaborative International Dictionary
Perfidies
Perfidy \Per"fi*dy\ (p[~e]r"f[i^]*d[y^]), n.; pl. Perfidies (p[~e]r"f[i^]*d[i^]z). [L. perfidia, fr. L. perfidus faithless; per (cf. Skr. par[=a] 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.
Wiktionary
perfidies
n. (plural of perfidy English)
Usage examples of "perfidies".
Catulus Caesar subjected me to a long lecture on the perfidies of Italians.