perfidy

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per·fi·dy

 (pûr′fĭ-dē)
n. pl. per·fi·dies
1. Deliberate breach of faith; calculated violation of trust; treachery: "the fink, whose perfidy was equaled only by his gall" (Gilbert Millstein).
2. The act or an instance of treachery.

[Latin perfidia, from perfidus, treacherous : per-, to destruction; see per- + fidēs, faith; see bheidh- in Indo-European roots.]

perfidy

(ˈpɜːfɪdɪ)
n, pl -dies
a perfidious act
[C16: from Latin perfidia, from perfidus faithless, from per beyond + fidēs faith]

per•fi•dy

(ˈpɜr fɪ di)

n., pl. -dies.
1. deliberate breach of faith or trust; faithlessness; treachery.
2. an act or instance of faithlessness or treachery.
[1585–95; < Latin perfidia faithlessness =perfid(us) faithless, treacherous (per- per- + -fidus, derivative of fidēs faith) + -ia -y3]

perfidy

1. breach of trust, especially treachery or treason.
2. an act or instance of this. — perfidious, adj.
See also: Treason
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.perfidy - betrayal of a trustperfidy - betrayal of a trust      
disloyalty - the quality of being disloyal
insidiousness - the quality of being designed to entrap
2.perfidy - an act of deliberate betrayalperfidy - an act of deliberate betrayal  
knavery, dishonesty - lack of honesty; acts of lying or cheating or stealing
double cross, double-crossing - an act of betrayal; "he gave us the old double cross"; "I could no longer tolerate his impudent double-crossing"
sellout - an act of betrayal

perfidy

noun (Literary) treachery, betrayal, infidelity, treason, deceit, duplicity, disloyalty, double-dealing, falsity, faithlessness, perfidiousness He cited many examples to illustrate the perfidy of his adversaries.

perfidy

noun
2. Willful betrayal of fidelity, confidence, or trust:
Translations

perfidy

[ˈpɜːfɪdɪ] N (liter) → perfidia f

perfidy

[ˈpɜːrfədi] (literary) n (= treachery) → perfidie f

perfidy

n (liter)Perfidie f (liter)

perfidy

[ˈpɜːfɪdɪ] nperfidia
References in classic literature ?
For Rosalind was no victim of the monster man, as you may have supposed her, no illustration of his immemorial perfidies.
Maciel's perfidies and if there is a root-and-branch examination of possible complicity in those perfidies within the Legion of Christ," Weigel said.
To all this is added the narrator's incestuous relationship with his sister and his father's cruelties and perfidies.