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
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Antonyms & Near Antonyms
Example Sentences
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Recent Examples of unfaithfulness
Harbour also recently made headlines following the release of estranged wife Lily Allen's latest album, West End Girl, which contained references many interpreted as pointing toward alleged unfaithfulness on Harbour's part, though the actor isn't explicitly named in the lyrics.
—
Joey Nolfi, Entertainment Weekly, 7 Nov. 2025
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
Joey Nolfi, Entertainment Weekly, 7 Nov. 2025
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
Recent Examples of Synonyms for unfaithfulness
Noun
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Allen, 40, accused her ex-husband of infidelity in various capacities on the 14-track album.—
Lex Goldstein,
PEOPLE,
7 Nov. 2025
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The film centers on Smita, a small-town housewife whose seemingly ordinary life unravels into a narrative exploring infidelity, deceit and moral ambiguity.—
Naman Ramachandran,
Variety,
7 Nov. 2025
Noun
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The former activity can be useful; the latter is a clear betrayal.—
Damon Beres,
The Atlantic,
5 Nov. 2025
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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,
5 Nov. 2025
Noun
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Bianca filed for divorce on the grounds of adultery in 1978, a year after Mick started seeing model Jerry Hall.—
Marina Watts,
PEOPLE,
30 Oct. 2025
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As China’s economy has grown, so too has its incidence of adultery.—
Sheri Linden,
HollywoodReporter,
23 Oct. 2025
Noun
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Tarabay leads the cast as the titular Ashur, now thriving after his treachery.—
Randall Colburn,
Entertainment Weekly,
3 Nov. 2025
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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
Noun
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Former Ray County Sheriff Scott Childers, whose tenure was dogged by a maelstrom of misconduct allegations that led to his resignation, appeared in federal court in downtown Kansas City on civil rights violation charges on Wednesday.—
Kacen Bayless,
Kansas City Star,
5 Nov. 2025
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Greenfield Police Chief Jay Johnson faces a felony misconduct charge for allegedly using a police camera at his private residence.—
Adrienne Davis,
jsonline.com,
5 Nov. 2025
Noun
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Its leader Tundu Lissu has been detained on charges of treason after Hassan’s government accused him of planning to disrupt the October 29 election.—
Nimi Princewill,
CNN Money,
5 Nov. 2025
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The country's largest opposition party Chadema was banned from contesting the elections and its leader Tundu Lissu is currently on trial on treason charges.—
Kate Bartlett,
NPR,
3 Nov. 2025
Noun
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The first accounts of cheating and payoffs during exam week surfaced—a blow to the belief in fairness on which the whole system of guilds depended.—
George Packer,
The Atlantic,
6 Nov. 2025
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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
Cite this Entry
“Unfaithfulness.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/unfaithfulness. Accessed 17 Nov. 2025.
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