Definition of perfidy in English:

perfidy

noun

literary
  • Deceitfulness; untrustworthiness.

    • ‘Think of the valiant whistleblower inside a corporation or an agency who puts himself at risk to uncover criminal perfidy.’
    • ‘They brook no compromise and instead repay those who would reach out to them with furious perfidy unless they show absolute fealty to every facet of the program.’
    • ‘I have been accused of perfidy, malingering, duplicity, charlatanism and forty other words that I don't know the meaning of.’
    • ‘His book is a tale of cowardice, perfidy, hubris, idiocy and occasional heroism - told with considerable panache.’
    • ‘With possible political perfidy such a hot topic at Westminster, it is with perfect timing that the Lyceum and Citizens' theatres bring two of England's great plays of history and politics to the stage.’
    treachery, duplicity, deceit, perfidiousness, deceitfulness, disloyalty, infidelity, faithlessness, unfaithfulness, betrayal, treason, falseness, falsity, double-dealing, dishonesty, two-facedness, untrustworthiness, breach of trust
    false-heartedness, punic faith
    View synonyms

Origin

Late 16th century: via French from Latin perfidia, from perfidus treacherous based on per- to ill effect + fides faith.

Pronunciation

perfidy

/ˈpərfədē/