The meaning of PERFIDY is the quality or state of being faithless or disloyal : treachery. How to use perfidy in a sentence.

PERFIDY definition: deliberate breach of faith or trust; faithlessness; treachery. See examples of perfidy used in a sentence.

PERFIDY definition: 1. behaviour that is not loyal 2. behavior that is not loyal. Learn more.

Define perfidy. perfidy synonyms, perfidy pronunciation, perfidy translation, English dictionary definition of perfidy. n. pl. per·fi·dies 1. Deliberate breach of faith; calculated violation of trust; …

Definition of perfidy noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Dec 14, 2025 · 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 Synonyms: betrayal, …

PERFIDY meaning: the act of betraying someone or something the state of not being loyal

If you shared your most embarrassing secrets with a friend who then told them to everyone he knows, his betrayal could be described as perfidy.

Factsheet What does the noun perfidy mean? There are two meanings listed in OED's entry for the noun perfidy. See ‘Meaning & use’ for definitions, usage, and quotation evidence.

1. Deliberate breach of faith; calculated violation of trust; treachery: "the fink, whose perfidy was equaled only by his gall" (Gilbert Millstein). 2. The act or an instance of treachery.