1
as in infidelity
lack of faithfulness especially to one's husband or wife
he eventually forgave his wife's unfaithfulness
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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
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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
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Example Sentences
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Recent Examples of unfaithfulness
Milvia Marigliano is a hoot as Coco Vulori, an old dear friend with some very loud opinions to express, and maybe the key to helping DeSantis solve his wife’s onetime unfaithfulness.
—
Pete Hammond, Deadline, 27 Aug. 2025
Pete Hammond, Deadline, 27 Aug. 2025
Recent Examples of Synonyms for unfaithfulness
Noun
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In China, a new industry has emerged devoted to helping couples stay married in the face of infidelity.—
Jill Goldsmith,
Deadline,
24 Oct. 2025
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Summer Walker has addressed the infidelity accusations surrounding her ex-boyfriend Lil Meech.—
Mackenzie Cummings-Grady,
Billboard,
23 Oct. 2025
Noun
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Having two fellow cohorts who are both women, who are both considered outsiders, who are both women of color, navigating a very specific set of challenges, that dynamic and the betrayal, ultimately, what happens is so tragic to me.—
Dessi Gomez,
Deadline,
22 Oct. 2025
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Pursued by brutal mercenaries and a deadly assassin, the trio must navigate twists, betrayals and historical secrets buried deep in Europe’s past.—
Leo Barraclough,
Variety,
22 Oct. 2025
Noun
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As China’s economy has grown, so too has its incidence of adultery.—
Sheri Linden,
HollywoodReporter,
23 Oct. 2025
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Unhappy unions loom large in the novel, which teems with adultery.—
Katy Waldman,
New Yorker,
22 Sep. 2025
Noun
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And when the surviving crew interrogates the android Ash about his treachery, the book has him pretty much spill the space beans.—
Daniel Dockery,
Vulture,
22 Sep. 2025
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When does compromise become treachery or defeat?—
Literary Hub,
Literary Hub,
3 Sep. 2025
Noun
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Last year, Strictly was hit with scandal as two professional dancers exited following allegations of misconduct.—
Max Goldbart,
Deadline,
23 Oct. 2025
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Russ Anderson also failed to challenge the bank’s incentive compensation program, failed to institute effective controls and repeatedly downplayed sales practices misconduct, Hsu previously said.—
Desiree Mathurin,
Charlotte Observer,
23 Oct. 2025
Noun
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Directed by Oscar winner Bille August, The Count of Monte Cristo stars Claflin as Edmond Dantès, a young sailor who was falsely accused of treason and is imprisoned without trial in the Château d’If, a grim island fortress off Marseille, France.—
Lynette Rice,
Deadline,
22 Oct. 2025
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He was later tried for treason and eventually hanged.—
Peter D'Abrosca,
FOXNews.com,
22 Oct. 2025
Noun
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These defendants, which include former professional athletes, used high-tech cheating technology to steal millions of dollars from victims in underground poker games that were secretly fixed.—
Anna Lazarus Caplan,
PEOPLE,
23 Oct. 2025
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Naroditsky, whose cause of death has not been made public, had vigorously denied cheating, and other chess champions agreed the claims were baseless.—
Julia Prodis Sulek,
Mercury News,
23 Oct. 2025
Cite this Entry
“Unfaithfulness.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/unfaithfulness. Accessed 28 Oct. 2025.
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