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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Because sometimes, the slow erosion of a relationship isn’t caused by infidelity at all, but by the quiet ache of a partner who gives just enough to get by.—
Essence,
Essence,
12 Sep. 2025
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The emotional record, shared alongside a video and lyrics posted to Instagram, hears Thugger addressing infidelity, loyalty, fractured friendships, while taking full accountability for his mistakes.—
Amber Corrine,
VIBE.com,
12 Sep. 2025
Noun
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This final betrayal will be his undoing, as the enraged creature, doomed to live without connection, care, or love, finally snaps and destroys everything Victor holds dear.—
Thomas Page McBee,
Travel + Leisure,
16 Sep. 2025
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Your narrative, with its shifting of points of view among four longtime friends, allows for intimacy and drama as well as betrayals and loss as Desiree, Nakia, Monique and January (with Desiree’s estranged sister Danielle mostly on the sidelines) each tell their stories.—
Jane Ciabattari
September 16,
Literary Hub,
16 Sep. 2025
Noun
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In addition, Swazi law has a different definition of adultery for men and for women.—
The Editors,
JSTOR Daily,
15 Aug. 2025
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Certain artistic genres were employed to publicize and critique changes to laws regarding adultery and divorce.—
Smithsonian Magazine,
Smithsonian Magazine,
29 July 2025
Noun
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When does compromise become treachery or defeat?—
Literary Hub,
Literary Hub,
3 Sep. 2025
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Could Juno be behind this treachery, as payback for David destroying her spy corporation and for changing his oldest daughter into a killer?—
Demetrius Patterson,
HollywoodReporter,
27 Aug. 2025
Noun
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Paxton’s history of misconduct is years in the making.—
Kimberly Ross,
The Washington Examiner,
12 Sep. 2025
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Paragon was linked to alleged misconduct in Europe after WhatsApp reported that Italian journalists and civil society members had been targeted with its technology.—
Vas Panagiotopoulos,
ArsTechnica,
11 Sep. 2025
Noun
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The main opposition party, CHADEMA, was disqualified in April and its leader Tundu Lissu remains in custody after he was charged with treason for demanding electoral reforms.—
Preeti Jha,
semafor.com,
29 Aug. 2025
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Ksenia Mironova copes with the absence of her fiancé, also a journalist, who is in prison on charges of treason.—
Justin Chang,
New Yorker,
14 Aug. 2025
Noun
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When yet another affair is discovered (Kate Upton), all three women team up to plot mutual revenge on their cheating, lying, three-timing SOB.—
Caitlin White,
Variety,
2 Sep. 2025
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Byron had his arms wrapped around the company's HR chief, Kristin Cabot, and subsequently faced cheating allegations after they were spotted on the jumbotron.—
Megan Cartwright,
MSNBC Newsweek,
1 Sep. 2025
Cite this Entry
“Unfaithfulness.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/unfaithfulness. Accessed 18 Sep. 2025.
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