Hypertext Webster Gateway: "perfidy"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Perfidy \Per"fi*dy\ (p[~e]r"f[i^]*d[y^]), n.; pl. {Perfidies}
(-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.
From WordNet (r) 1.7 (wn)
perfidy
n 1: betrayal of a trust [syn: {perfidiousness}, {treachery}]
2: an act of deliberate betrayal [syn: {treachery}, {betrayal},
{treason}]
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