1
as in infidelity
lack of faithfulness especially to one's husband or wife
his wife's perfidy was a moment of uncharacteristic weakness
Synonyms & Similar Words
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Antonyms & Near Antonyms
2
as in treachery
the act or fact of violating the trust or confidence of another
the full cost—both in compromised intelligence and in human life—of the double agent's perfidy is not yet known
Synonyms & Similar Words
Antonyms & Near Antonyms
Example Sentences
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Recent Examples of perfidy
Ever since, the president and his closest allies haven’t stopped trying to repackage the perfidy as patriotism.
—
Bloomberg Opinion, Twin Cities, 27 Nov. 2025
The ignorance, the hubris, the lies, the perfidy.
—Wesley Stenzel, Entertainment Weekly, 31 Oct. 2025
All that said, Trump’s willingness to forgive the legal sins of former GOP congressman is a notable footnote to an often wretched history of pardon perfidy engaged in by presidents of both parties.
—David Mark, The Washington Examiner, 31 Oct. 2025
Yet the Pressler Amendment was hardly an instance of American perfidy, and the F-16 sales thus validated a key Pakistani myth about American behavior.
—C. Christine Fair, Foreign Affairs, 18 Aug. 2015
See All Example Sentences for perfidy
Bloomberg Opinion, Twin Cities, 27 Nov. 2025
The ignorance, the hubris, the lies, the perfidy.
—Wesley Stenzel, Entertainment Weekly, 31 Oct. 2025
All that said, Trump’s willingness to forgive the legal sins of former GOP congressman is a notable footnote to an often wretched history of pardon perfidy engaged in by presidents of both parties.
—David Mark, The Washington Examiner, 31 Oct. 2025
Yet the Pressler Amendment was hardly an instance of American perfidy, and the F-16 sales thus validated a key Pakistani myth about American behavior.
—C. Christine Fair, Foreign Affairs, 18 Aug. 2015
See All Example Sentences for perfidy
Recent Examples of Synonyms for perfidy
Noun
-
Otake said Gerhardt Konig was not someone who would try to commit murder, but someone who was struggling with infidelity and trying to do his best.—
ABC News,
ABC News,
8 Apr. 2026
-
Tensions notably come to a head between Bennie and his sister-in-law, Lucretia (a game Wanda Sykes), because of his past infidelity, which provides some of the sitcom's funniest moments via razor-sharp one-liner wars.—
Andrew Walsh,
Entertainment Weekly,
5 Apr. 2026
Noun
-
Undocumented immigrants venture from Mexico, often underestimating of the treachery of the landscape.—
Shi En Kim,
AZCentral.com,
26 Mar. 2026
-
Jonathan Cute kept probing the murky realms between tourism and treachery.—
Adam Ciralsky,
Vanity Fair,
19 Mar. 2026
Noun
-
The Bible teaches that lying, stealing, adultery and coveting your neighbor’s property are sins.—
Sun Sentinel Editorial Board,
Sun Sentinel,
16 Mar. 2026
-
The facile novelty of adultery is its own mask, a sexy way of dressing up a deep, frightened longing for security.—
Sara Holdren,
Vulture,
6 Mar. 2026
Noun
-
While some conservatives have described the war as a betrayal, many other Republicans have cheered on the president’s actions.—
Michelle L. Price,
Los Angeles Times,
1 Apr. 2026
-
The result is a second victimization — spiritual betrayal by those called to protect.—
Ed Gaskin,
Boston Herald,
29 Mar. 2026
Noun
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Pictures removed Azmoun later removed the pictures but was still lambasted on state TV on Thursday with soccer pundit Mohammad Misaghi saying the striker’s actions had been an act of disloyalty.—
Reuters,
CNN Money,
20 Mar. 2026
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Research on group dynamics shows that dissent is often interpreted as disloyalty rather than contribution.—
Benjamin Laker,
Forbes.com,
16 Jan. 2026
Noun
-
Consider this evilmeister’s brazen acts of treason and revenge, unbounded deceit, swinish immorality and negative role modeling.—
Voice of the People,
New York Daily News,
5 Apr. 2026
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She was imprisoned in Salimgarh Fort (a part of Red Fort) in Delhi by her father for more than 20 years for inciting her brother, Muhammad Akbar, to commit treason.—
Tamanna Nangia,
Encyclopedia Britannica,
2 Apr. 2026
Cite this Entry
“Perfidy.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/perfidy. Accessed 10 Apr. 2026.
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