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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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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For many couples, infidelity is a nonnegotiable breach of trust, never to be forgiven.—
Stephanie Zacharek,
Time,
4 Sep. 2025
-
The second season saw the #MomTok group dissipate with Taylor Frankie Paul’s infidelity and the drama with his mistress Jenna.—
Peter White,
Deadline,
28 Aug. 2025
Noun
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The sense of shock and betrayal is palpable in the Qatari capital.—
Paula Hancocks,
CNN Money,
10 Sep. 2025
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Watching the actors sign language through glee, heartache, torment and even betrayal makes for some stunning scene work.—
Lily Ford,
HollywoodReporter,
9 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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Boy Meets World — Savage’s comedy legacy has been marred by multiple misconduct allegations over the years.—
Emily Blackwood,
PEOPLE,
5 Sep. 2025
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The senior pastor at the historic First Presbyterian Church of Charlotte in uptown was fired after allegations of misconduct proved true, the church said in an email Wednesday.—
Charlotte Observer,
Charlotte Observer,
4 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 11 Sep. 2025.
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