perfidy

[pur-fi-dee]
noun, plural perfidies.
1.
deliberate breach of faith or trust; faithlessness; treachery: perfidy that goes unpunished.
2.
an act or instance of faithlessness or treachery.

Origin:
1585–95; < Latin perfidia faithlessness, equivalent to perfid(us) faithless, literally, through (i.e., beyond the limits of) faith (per- per- + fid(ēs) faith + -us adj. suffix) + -ia -y3


See disloyalty.
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World English Dictionary
perfidy (ˈpɜːfɪdɪ)
 
n , pl -dies
a perfidious act
 
[C16: from Latin perfidia, from perfidus faithless, from per beyond + fidēs faith]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

perfidy
1590s, from M.Fr. perfidie, from L. perfidia "falsehood, treachery," from perfidus "faithless," from phrase per fidem decipere "to deceive through trustingness," from per "through" (see per) + fidem (nom. fides) "faith" (see faith). Related: perfidious (1590s).
"[C]ombinations of wickedness would overwhelm the world by the advantage which licentious principles afford, did not those who have long practiced perfidy grow faithless to each other." [Samuel Johnson, "Life of Waller"]
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The perfidy and mendacity that follow mesmerize as much as they ring true.
For example, the extent and perfidy of the "ethanol" scam is now
  coming to light.
But she's sharp on the nitty-gritty of female friendships and male perfidy.
That would be just rewarding them for their perfidy.
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