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perfidy

[pur-fi-dee] /ˈpɜr fɪ di/
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 of perfidy
1585-1595
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
Synonyms
See disloyalty.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for perfidy

perfidy

/ˈpɜːfɪdɪ/
noun (pl) -dies
1.
a perfidious act
Word Origin
C16: from Latin perfidia, from perfidus faithless, from per beyond + fidēs faith
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for perfidy
n.

1590s, from Middle French perfidie (16c.), from Latin perfidia "faithlessness, falsehood, treachery," from perfidus "faithless," from phrase per fidem decipere "to deceive through trustingness," from per "through" (see per) + fidem (nominative fides) "faith" (see faith).

[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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