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
Synonyms & Similar Words
Antonyms & Near Antonyms
Example Sentences
Recent Examples of Synonyms for unfaithfulness
Noun
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What follows is a hilarious account of infatuation and infidelity from the point of view of Roberta, a graduate student who has it bad for Simone, her utterly chic — and married — writing professor.—
Jasmine Vojdani,
Vulture,
1 Aug. 2025 -
One of the major causes of broken trust between partners is infidelity, but breaches of trust can happen for many other reasons.—
Mark Travers,
Forbes.com,
31 July 2025
Noun
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Keating said this was nothing but a disgusting betrayal that the U.S. government would not take care of those people who took care of them.—
Livi Stanford,
Hartford Courant,
6 Aug. 2025
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As Morgan’s teenage daughter Clara (Grace) is falling in love for the first time with Miller (Thames), the duo must face tragedy and uncover new betrayals after Morgan’s husband (Scott Eastwood) dies in a car accident with her sister Jenny.—
Brittany Spanos,
Rolling Stone,
5 Aug. 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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Thus far, this prosecution, and a corresponding case against the gang in Sacramento, have been rife with evidence of treachery and violence inside and outside of prison.—
Nate Gartrell,
Mercury News,
31 July 2025
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The six-parter, to debut July 14, follows six groups of friends, and six historical cases of murder and treachery among them.—
Etan Vlessing,
HollywoodReporter,
19 June 2025
Noun
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The oversight group also submitted a complaint to the Office of Congressional Conduct, which until this year was called the Office of Congressional Ethics, the independent entity that reviews allegations of misconduct against House members and staff.—
Jeff McDonald,
San Diego Union-Tribune,
16 Aug. 2025
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One officer from Fort Lauderdale had been tried and acquitted of official misconduct.—
Rafael Olmeda,
Sun Sentinel,
15 Aug. 2025
Noun
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Zambada’s capture has led to a treason investigation in Mexico, since under Mexican law, treason includes kidnapping someone and shipping them to another country.—
John Annese,
New York Daily News,
5 Aug. 2025
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Tulsi Gabbard accused him of treason regarding Russian influence in previous presidential elections.—
Gabe Whisnant,
MSNBC Newsweek,
4 Aug. 2025
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Cite this Entry
“Unfaithfulness.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/unfaithfulness. Accessed 21 Aug. 2025.
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