1
as in adultery
lack of faithfulness especially to one's husband or wife
infidelity can lead to divorce
Synonyms & Similar Words
Relevance
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
Synonyms & Similar Words
Antonyms & Near Antonyms
Example Sentences
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Recent Examples of infidelity
Bunnie Xo would eventually forgive Jelly Roll for his infidelity.
—
Raechal Shewfelt,
Entertainment Weekly,
19 June 2026
That factored into her willingness to give her husband a second chance after his infidelity.
—
Lisa Respers France,
CNN Money,
16 June 2026
Despite the milestone, it was overshadowed by growing reports of marital strain and ongoing speculation about infidelity.
—
Elle Meier,
InStyle,
13 June 2026
To maximize their chances to claim the Senate, Democrats want to keep Maine in play, and there’s no indication yet that stories about Platner’s infidelities or his tattoo of a Nazi image are destroying his candidacy.
—
Burgess Everett,
semafor.com,
10 June 2026
See All Example Sentences for infidelity
Raechal Shewfelt,
Entertainment Weekly,
19 June 2026
That factored into her willingness to give her husband a second chance after his infidelity.
—
Lisa Respers France,
CNN Money,
16 June 2026
Despite the milestone, it was overshadowed by growing reports of marital strain and ongoing speculation about infidelity.
—
Elle Meier,
InStyle,
13 June 2026
To maximize their chances to claim the Senate, Democrats want to keep Maine in play, and there’s no indication yet that stories about Platner’s infidelities or his tattoo of a Nazi image are destroying his candidacy.
—
Burgess Everett,
semafor.com,
10 June 2026
See All Example Sentences for infidelity
Recent Examples of Synonyms for infidelity
Noun
-
The filings alleged adultery as the reason behind the divorce.
-
Public opinion is against adultery.
Noun
-
In movies, friendships end with a big blowup after there has been a significant betrayal by one party.
-
Whether discussing policing, immigration, criminal justice or foreign policy, compromise is treated as betrayal.
Noun
-
Heather Diehl | Getty Images More broadly, there can also be data-matching issues with Social Security numbers in ACA marketplace enrollment — meaning the lack of SSN may be a data issue, not misconduct, Oberlander said.
-
Allegations of employee misconduct are taken seriously and investigated thoroughly.
Noun
-
This is not treachery but the truest and noblest affection.
-
Peacock’s adventures in treachery The Traitors was the top dog, scoring five prizes including Best Competition Series and Best Host for Alan Cumming.
Noun
-
Researchers say this kind of chatbot cheating is common, increasing, and a significant warning sign.
-
Throughout her time on the show, Batula experienced the ups and downs of her relationship with Cooke, which included multiple cheating allegations on his part.
Noun
-
What constitutes treason is emerging as an early theme of House of the Dragon’s third season.
-
His attorney, Erias Lukwago, was taken from his house and later charged with an offense related to the concealment of treason.
Cite this Entry
“Infidelity.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/infidelity. Accessed 6 Jul. 2026.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
