1
as in adultery
lack of faithfulness especially to one's husband or wife
infidelity can lead to divorce
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Antonyms & Near Antonyms
2
as in betrayal
the act or fact of violating the trust or confidence of another
the one thing that the political boss will not forgive is infidelity
Synonyms & Similar Words
Antonyms & Near Antonyms
3
as in misconduct
a sexual encounter or relationship between a married person and someone other than their spouse
had known about his wife's infidelities for years
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Antonyms & Near Antonyms
Example Sentences
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Recent Examples of infidelity
The other traces a friendship between two middle-aged, male coworkers, both of whom are exploring infidelity—one by having an affair with the other’s wife.
—
Judy Berman, Time, 26 Feb. 2026
Gunn went on to say that the relationship, which spanned from the mid-'70s to the early '80s, had been punctuated by infidelity.
—Anna Kaufman, USA Today, 26 Feb. 2026
Their royal union was complicated by infidelity and intense media scrutiny.
—Bailey Bujnosek, InStyle, 25 Feb. 2026
Yasmin puts that mission into motion by meeting with Henry’s uncle Alexander to tell him about Henry’s drug use and infidelity.
—Roxana Hadadi, Vulture, 23 Feb. 2026
See All Example Sentences for infidelity
Judy Berman, Time, 26 Feb. 2026
Gunn went on to say that the relationship, which spanned from the mid-'70s to the early '80s, had been punctuated by infidelity.
—Anna Kaufman, USA Today, 26 Feb. 2026
Their royal union was complicated by infidelity and intense media scrutiny.
—Bailey Bujnosek, InStyle, 25 Feb. 2026
Yasmin puts that mission into motion by meeting with Henry’s uncle Alexander to tell him about Henry’s drug use and infidelity.
—Roxana Hadadi, Vulture, 23 Feb. 2026
See All Example Sentences for infidelity
Recent Examples of Synonyms for infidelity
Noun
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The facile novelty of adultery is its own mask, a sexy way of dressing up a deep, frightened longing for security.—
Sara Holdren,
Vulture,
6 Mar. 2026
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The Texas attorney general beat a 2023 impeachment trial on corruption charges and reached a deal to end a long-running securities fraud case but now faces a contentious divorce over allegations of adultery.—
Meg Kinnard,
Chicago Tribune,
17 Feb. 2026
Noun
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The reality star's betrayal cost him a pretty penny in the end.—
Emlyn Travis,
Entertainment Weekly,
5 Mar. 2026
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To ventriloquize one’s parent is a bold move, and fictitious Barbara would absolutely read it as a betrayal.—
Literary Hub,
Literary Hub,
5 Mar. 2026
Noun
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Since the intoxication allegation came to light, the Phan brothers’ attorneys have filed motions to hold an evidentiary hearing to learn more about the crash and to dismiss their case all together for potential prosecutorial misconduct.—
Colleen Cronin,
Boston Herald,
2 Mar. 2026
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But Gonzales is now contending with misconduct allegations involving a staffer who later died by suicide.—
Hunter Woodall,
CBS News,
2 Mar. 2026
Noun
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After Thomas Hickey was hanged that year for mutiny, sedition and treachery, Washington warned that his fate should serve as a caution to all soldiers.—
Kim Hjelmgaard,
USA Today,
26 Feb. 2026
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With their leader detained, El Mayo’s sicarios, or hit men, declared war against supporters of Chapo’s sons in an attempt to exact vengeance for the treachery and strengthen their own position in the wider organization.—
Daniel DePetris,
Mercury News,
26 Feb. 2026
Noun
-
That cheating is rampant in our elections.—
TIME Staff,
Time,
25 Feb. 2026
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Not every young person feels this type of cheating is wrong.—
Eva Roytburg,
Fortune,
24 Feb. 2026
Noun
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Ocalan, 76, has been imprisoned on the island of Imrali, off the coast of Istanbul, since 1999, after being convicted of treason.—
ABC News,
ABC News,
27 Feb. 2026
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Fearful of being captured and charged with treason for opposing British rule, American leaders would gather in private homes or taverns.—
Phaedra Trethan,
USA Today,
23 Feb. 2026
Cite this Entry
“Infidelity.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/infidelity. Accessed 9 Mar. 2026.
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