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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Kate divorced Jon, 48, in 2009 amid reports of infidelity surrounding her now ex-husband.
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Skratch also interviewed other sources for its story who alleged infidelity by Mickelson amid abrupt endings of memberships at other golf clubs.
Noun
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The filings alleged adultery as the reason behind the divorce.
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Public opinion is against adultery.
Noun
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In movies, friendships end with a big blowup after there has been a significant betrayal by one party.
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Whether discussing policing, immigration, criminal justice or foreign policy, compromise is treated as betrayal.
Noun
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If the landing had been faked, the Soviets would have figured it out and would have loved to reveal to the world America’s perfidy.
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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.
Noun
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And still, some people insist that admitting the flaws in our history — and our present — constitutes an act of innate disloyalty.
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Treating rumors as diagnostic signals of uncertainty or weak trust, rather than disloyalty, helps leaders improve communication and align words with observable actions.
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“Perfidiousness.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/perfidiousness. Accessed 6 Jul. 2026.
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