Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “perfidy”

perfidy

noun [U]     /ˈpɜː.fɪ.di/ US  /ˈpɝː.fə-/ literary
behaviour that is not loyalDisloyalty, betrayal and treason
(Definition of perfidy noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of perfidy

Translations of “perfidy”

Word of the Day

closeness

the quality of knowing someone very well, liking them a lot, and wanting to spend a lot of time together

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More