Usually means: Deliberate breach of faith, trust.
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We found 29 dictionaries that define the word perfidy:

General (25 matching dictionaries)
  1. perfidy: Longman Dictionary of Contemporary English
  2. perfidy: Merriam-Webster
  3. perfidy: Oxford Learner's Dictionaries
  4. perfidy: American Heritage Dictionary of the English Language
  5. perfidy: Collins English Dictionary
  6. perfidy: Vocabulary.com
  7. Perfidy, perfidy: Wordnik
  8. perfidy: Cambridge Advanced Learner's Dictionary
  9. perfidy: Wiktionary
  10. perfidy: Webster's New World College Dictionary, 4th Ed.
  11. perfidy: The Wordsmyth English Dictionary-Thesaurus
  12. perfidy: Infoplease Dictionary
  13. Perfidy, perfidy: Dictionary.com
  14. perfidy: Online Etymology Dictionary
  15. Perfidy (book), Perfidy (disambiguation), Perfidy (film), Perfidy: Wikipedia, the Free Encyclopedia
  16. Perfidy: Online Plain Text English Dictionary
  17. perfidy: Webster's Revised Unabridged, 1913 Edition
  18. perfidy: Rhymezone
  19. Perfidy: AllWords.com Multi-Lingual Dictionary
  20. perfidy: Webster's 1828 Dictionary
  21. perfidy: FreeDictionary.org
  22. perfidy: Mnemonic Dictionary
  23. perfidy: TheFreeDictionary.com

Business (2 matching dictionaries)
  1. Bouvier's Law Dictionary 1856 Edition (No longer online)
  2. perfidy: Legal dictionary

Computing (1 matching dictionary)
  1. perfidy: Encyclopedia

Slang (1 matching dictionary)
  1. Perfidy: Urban Dictionary

(Note: See perfidies as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  A state or act of violating faith or allegiance; violation of a promise or vow, or of trust.
noun:  (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.
noun:  A state or act of deceit.

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