1
as in infidelity
lack of faithfulness especially to one's husband or wife
he eventually forgave his wife's unfaithfulness
Synonyms & Similar Words
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Antonyms & Near Antonyms
2
as in betrayal
the act or fact of violating the trust or confidence of another
the jaw-dropping unfaithfulness of the person she had considered her best friend was deeply hurtful
Synonyms & Similar Words
Antonyms & Near Antonyms
3
as in adultery
a sexual encounter or relationship between a married person and someone other than their spouse
there were charges of unfaithfulness on both sides
Synonyms & Similar Words
Antonyms & Near Antonyms
Example Sentences
Recent Examples of Synonyms for unfaithfulness
Noun
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Honey is typically in the business of infidelity, taking cases involving suspicious spouses and their philandering partners.—
Lovia Gyarkye,
HollywoodReporter,
23 May 2025 -
The entrepreneur and wellness coach addressed rumors of infidelity while responding directly to a fan’s accusation on Instagram.—
Amber Corrine,
VIBE.com,
23 May 2025
Noun
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One professor challenged that reasoning, which Casas repeated during the panel on Wednesday, telling the police chief that for students with fragile immigration statuses, being detained by university police would feel like a betrayal.—
Garrett Shanley,
Miami Herald,
23 May 2025
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In the aftermath, Mahnaz will be forced to confront betrayal and loss, and to embark on a quest for justice.—
Baz Bamigboye,
Deadline,
22 May 2025
Noun
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Directed by Jonathan Li and Choy Man-yu, the film stars Louis Koo as a private detective investigating a complex case involving adultery and murder.—
Naman Ramachandran,
Variety,
2 June 2025
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Many scandals arise from the occasion of these activities, and adulteries and other outrageous crimes are committed as a clear offence to God, a very serious danger to the souls of those committing them, and a pernicious example to others.—
The Editors,
JSTOR Daily,
27 Mar. 2025
Noun
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Press play below to learn more about Wells’ treachery, and to get a sneak peek at the fugitive interacting with her latest target.—
Matt Webb Mitovich,
TVLine,
7 Apr. 2025
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Sinners is one of the great vampire movies of the modern age, mining the legend of these perpetual outsiders who desperately yearn to belong, but whose silky promises are rooted in treachery.—
Stephanie Zacharek,
Time,
29 Apr. 2025
Noun
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Critics have accused deputy cliques of engaging in brawls and other misconduct.—
Connor Sheets,
Los Angeles Times,
6 June 2025
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Because an employee is not eligible for unemployment benefits if the person was fired for misconduct, Wisconsin doesn’t want to have to decide the legitimacy of a firing that was based on matters of religious faith and doctrine.—
Maureen Groppe,
USA Today,
6 June 2025
Noun
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Lee’s campaign has asserted that a sitting president cannot be criminally prosecuted, except in cases of treason.—
Jong Eun Lee,
The Conversation,
29 May 2025
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The cost of failure would have been death on the grounds of treason.—
Daniel Twining,
National Review,
22 May 2025
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Cite this Entry
“Unfaithfulness.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/unfaithfulness. Accessed 10 Jun. 2025.
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