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Definitions

perfidy

[pur-fi-dee] / ˈpɜr fɪ di /
NOUN
treachery
Synonyms
STRONG
betrayal bunco corruption disaffection dodge double-dealing duplicity faithlessness fake falseness flimflam infidelity perfidiousness put on racket scam sellout spoof treason whitewash
WEAK
dirty dealing dirty pool dirty trick dirty work double-cross fast shuffle grift recreancy shell game skin game stab in the back sweet-talk treacherousness two-timing
Antonyms
STRONG
faithfulness fidelity forthrightness harmony honesty loyalty truthfulness
NOUN
faithlessness
Synonyms
STRONG
betrayal disbelief dishonesty disloyalty doubt falseness falsity fickleness fraud inconstancy infidelity perfidiousness skepticism traitorousness treachery treason unfaithfulness
WEAK
false-heartedness treacherousness
Antonyms
STRONG
belief devotion fairness faithfulness fidelity honesty loyalty trust truthfulness

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

A former JAG and current professor at Texas Tech University, Geoffrey Corn, said the U.S. has considered perfidy a crime in non-international armed conflicts.

From Salon • Jan. 13, 2026

Jack soon learns, in Robert Penn Warren’s saga of perfidy and corruption, that Gov. Stark is right.

From The Wall Street Journal • Oct. 23, 2025

Bristling and increasingly convinced of Western perfidy and decadence, he was in many respects a changed man.

From Seattle Times • Mar. 26, 2022

But when Nikki meets him after trailing him to his fancy hotel, his elegant perfidy soon fades in the face of larger, out-and-out treachery.

From New York Times • Apr. 2, 2021

Isn’t it ridiculous to think that a mouse could ever forgive anyone for such perfidy?

From "The Tale of Despereaux: Being the Story of a Mouse, a Princess, Some Soup and a Spool of Thread" by Kate DiCamillo

Vocabulary lists containing perfidy

The Declaration of Independence

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A Web of Lies

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Excerpt from "The Declaration of Independence"

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