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''perfidy'' ▫ᴱᴺ｜Definition｜1st｜20260130210911-00-⌔

perfidy - Wiktionary, the free dictionary

English

Noun

perfidy (countable and uncountable, plural perfidies)

• A state or act of violating faith or allegiance; violation of a promise or vow, or of trust.
  • ✤ Synonyms: betrayal, treachery, perfidiousness; see also Thesaurus: betrayal
• (international law, in warfare) An illegitimate act of deception, such as using symbols like the Red Cross or white flag in a false claim of surrender to gain proximity to an enemy for purposes of attack.
  • ✤ Stratagems must be carefully distinguished strategy from perfidy, since the former are allowed, whereas the latter is prohibited.¹
  • ✤ Abuse of a protective emblem amounts to perfidy and constitutes a war crime under the customary law of armed conflict.²
  • ✤ Ruses of war are legitimate so long as they do not involve treachery or perfidy on the part of the belligerent resorting to them.³
  • ✤ Cyberattacks almost inevitably involve an element of deception, such as tricking a user to click on a malicious link. So, to what extent could cyberattacks count as perfidy and therefore be illegal given international humanitarian law?⁴
• A state or act of deceit.
  • ✤ Synonyms: perfidiousness, underhandedness, trickery; see also Thesaurus: deceit, Thesaurus: deception
  • ✤ Germans could not get over the perfidy of it. It was unbelievable that the English, having degenerated to the stage where suffragettes heckled the Prime Minister and defied the police, were going to fight.⁵
  • ✤ Honda Motor Co. is the latest victim of e-mail perfidy, which started when a phony chain letter promised that the automaker would give away free cars.⁶
  • ✤ Letterman roared about the perfidy of lying politicos.⁷

Etymology

From Middle French perfidie, from Latin perfidia from perfidus (“faithless, treacherous, false”), from fides (“faith”); related to, for example, English fidelity.

Pronunciation

• (UK) IPA: /ˈpɜː.fɪ.di/
• Audio (Southern England): 🔊
• (US) IPA: /ˈpɝ.fɪ.di/

Printed 2026-06-28.

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Footnotes

1. 1921, Lassa Oppenheim with Ronald Francis Roxburgh, International law: a treatise, page 229: ↩

2. 1993, Leslie C. Green, The contemporary law of armed conflict, page 89: ↩

3. 2008, Sidney Axinn, A Moral Military, page 84: ↩

4. 2012 June 5, Patrick Lin, Neil Rowe, Fritz Allhoff, “Is It Possible to Wage a Just Cyberwar?”, in The Atlantic ‎${}^{[1]}$: ↩

5. 1962, Barbara Wertheim Tuchman, The Guns of August, page 154: ↩

6. 2000 July 17, “Honda becomes chain letter victim”, in eWeek: ↩

7. 2008 October 16, “McCain expected to make amends on Letterman show”, in Los Angeles Times: ↩

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