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
The report has raised concerns of perfidy, an act of deception by military forces.
—
Jenna Prestininzi, Freep.com, 13 Jan. 2026
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
See All Example Sentences for perfidy
Jenna Prestininzi, Freep.com, 13 Jan. 2026
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
See All Example Sentences for perfidy
Recent Examples of Synonyms for perfidy
Noun
-
However, the relationship remained volatile, and rumors of infidelity persisted.—
Meredith Kile,
PEOPLE,
1 May 2026
-
The Grammy winner, 31, who debuted late last month as Zidler in the Tony-winning adaptation of the 2001 musical film, will now be taking her final bow on Friday — less than a week after her post Saturday accusing 36-year-old Thompson of infidelity.—
Jami Ganz,
New York Daily News,
28 Apr. 2026
Noun
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Upon learning of Ava’s treachery, Deborah HOWLS.—
Jessica M. Goldstein,
Vulture,
1 May 2026
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Inflamed by Ratansen’s adviser’s account of Padmavati’s beauty, Alauddin Khalji storms the fortress by treachery rather than valor.—
Encyclopedia Britannica,
Encyclopedia Britannica,
9 Apr. 2026
Noun
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The Bible teaches that lying, stealing, adultery and coveting your neighbor’s property are sins.—
Sun Sentinel Editorial Board,
Sun Sentinel,
16 Mar. 2026
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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
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Our Extraordinary Summer by Lori Wilde Estranged sisters Calista and Athena Dempsey are forced to reunite on Hobby Island after their mother’s death, confronting old betrayals and unhealed wounds.—
Kait Hanson,
Southern Living,
2 May 2026
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Andrew Spar, president of the Florida Education Association, an umbrella organization for the local unions, quickly criticized the bill as a betrayal of working-class Floridians.—
Jeffrey S. Solochek,
Miami Herald,
1 May 2026
Noun
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Of the six House members expelled, the first three fought for the Confederacy during the Civil War and were expelled for disloyalty.—
Kevin Freking,
Sun Sentinel,
21 Apr. 2026
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The first three fought for the Confederacy during the Civil War and were expelled for disloyalty.—
ABC News,
ABC News,
21 Apr. 2026
Noun
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In 2004, Skripal was arrested on charges of treason.—
Nick Tabor,
Encyclopedia Britannica,
29 Apr. 2026
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Under existing law, lawmakers can lose their pensions if convicted of a federal crime that relates to public corruption, espionage, treason or several other national security offenses.—
Anna Liss-Roy The Washington Post,
Arkansas Online,
27 Apr. 2026
Cite this Entry
“Perfidy.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/perfidy. Accessed 8 May. 2026.
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