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See more synonyms for perfidy on Thesaurus.com
noun, plural per·fi·dies.
  1. deliberate breach of faith or trust; faithlessness; treachery: perfidy that goes unpunished.
  2. an act or instance of faithlessness or treachery.
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Origin of perfidy

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

Synonym study

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for perfidy

fake, infidelity, whitewash, scam, falseness, duplicity, sellout, dodge, treason, betrayal, flimflam, perfidiousness, gyp, spoof, disaffection, put-on, racket, corruption, double-dealing, bunco

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Contemporary Examples of perfidy

Historical Examples of perfidy

British Dictionary definitions for perfidy


noun plural -dies
  1. a perfidious act
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Word Origin for perfidy

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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for perfidy


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"]
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Online Etymology Dictionary, © 2010 Douglas Harper