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.

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

perfidy 1. breach of trust, especially treachery or treason. 2. an act or instance of this. — perfidious, adj. See also: Treason

Dec 14, 2025 · 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, …

In the context of war, perfidy is a form of deceptive tactic where one side pretends to act in good faith, such as signaling a truce (e.g., raising a white flag), but does so with the deliberate intention of …

Perfidy is the action of betraying someone or behaving very badly towards someone.

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.

Perfidy definition: Deliberate breach of faith; calculated violation of trust; treachery.