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
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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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The album details alleged infidelity by a partner, assumed to be Harbour.—
Thomas Smith,
Billboard,
30 Oct. 2025
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Directed by Kim Ki-young, the film is a cautionary tale about the dangers of infidelity, following a couple that hires a maid to help around the house while the wife is pregnant, only to have the young woman (Lee Eun-shim) destroy the family from the inside out.—
Katie Rife,
Entertainment Weekly,
28 Oct. 2025
Noun
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Over the course of eight episodes, the show traces how mounting pressures, deceit and betrayal led to patriarch Alex Murdaugh murdering his wife Maggie and their son Paul in 2021.—
Brianne Tracy,
PEOPLE,
29 Oct. 2025
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Fury will focus on the Sturlung Era, a period defined by family betrayal, shifting alliances and violent uprisings.—
Stewart Clarke,
Deadline,
28 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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That gap gives congregations wide latitude to hire and restore youth pastors, worship leaders and other associate ministers — including those with histories of misconduct.—
Mike Hixenbaugh,
NBC news,
30 Oct. 2025
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Springfield officials, meanwhile, called for a review of the department's hiring practices after previous allegations of misconduct against Grayson were revealed.—
Christopher Cann,
USA Today,
29 Oct. 2025
Noun
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Meanwhile, Chadema chair Tundu Lissu faces treason charges for advocating an election boycott and calling for a public revolt.—
Danish Manzoor Bhat,
MSNBC Newsweek,
26 Oct. 2025
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While murder and treason are the only crimes that allow Indiana judges to hold defendants without setting bond, judges can revoke bond if certain terms and conditions aren't followed.—
Ryan Murphy,
IndyStar,
24 Oct. 2025
Noun
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As the film begins, a mother (Kim Hye-soo) and her young daughter (Park Yeon-ah) have just moved into a new apartment after Mom caught Dad cheating.—
Katie Rife,
Entertainment Weekly,
28 Oct. 2025
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Faison and his girlfriend broke up because of the cheating, but, sharing a child, the two still lived together and were trying to work through their relationship, the girlfriend told police.—
Irene Wright,
Miami Herald,
28 Oct. 2025
Cite this Entry
“Unfaithfulness.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/unfaithfulness. Accessed 3 Nov. 2025.
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