as in infidelity
lack of faithfulness especially to one's husband or wife
perfidiousness eventually led to the couple's divorce
Synonyms & Similar Words
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Antonyms & Near Antonyms
Example Sentences
Recent Examples of Synonyms for perfidiousness
Noun
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With whom, by whom, and thanks to whom is of no significance to him whatsoever, so it can hardly be considered infidelity.—
Agnieszka Szpila,
Harpers Magazine,
24 Mar. 2026 -
Fans were outraged when rumors of infidelity on the Irish actor’s part began to circulate.—
Fleurine Tideman,
Glamour,
23 Mar. 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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Mamdani received intense backlash over the appeal from advocacy groups, who branded the flip-flop a betrayal.—
Josephine Stratman,
New York Daily News,
25 Mar. 2026
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As the consequences of that initial act spread through the household, the story develops through status, bloodline and resentment, building into a period drama centered on betrayal, ambition and the struggle for position within the family.—
Emiliano de Pablos,
Variety,
24 Mar. 2026
Noun
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Any time there is a crisis in Iran, the 1953 British-American coup against Prime Minister Mohammad Mossadegh is dusted off as Exhibit A in the case against Western perfidy.—
Bobby Ghosh,
Time,
5 Mar. 2026
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But the mayor’s dramatic tale of his predecessor’s fiscal fiddling was designed with a clear political agenda in mind: both to underline the magnitude of the problem and to identify the villains responsible for this perfidy.—
Washington Post,
Washington Post,
29 Jan. 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
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Cite this Entry
“Perfidiousness.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/perfidiousness. Accessed 1 Apr. 2026.
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