infidelity
noun
in·fi·del·i·ty
ˌin-fə-ˈde-lə-tē 
-(ˌ)fī-
plural infidelities
1
a
: the act or fact of having a romantic or sexual relationship with someone other than one's husband, wife, or partner
b
: unfaithfulness to a moral obligation : disloyalty
2
: lack of belief in a religion
Synonyms
Examples of infidelity in a Sentence
She was convinced that her husband was guilty of infidelity.
He has admitted to a number of marital infidelities.
Recent Examples on the Web
On top of that, Hegseth had to pay for his two divorces, at least in part due to his own infidelity.
—
Kyle Khan-Mullins, Forbes, 7 Feb. 2025
The story follows two neighbors, played by Tony Leung Chiu-wai and Maggie Cheung, who form a deep, unspoken connection after suspecting their spouses of infidelity.
—Janey Tracey, EW.com, 7 Feb. 2025
While neither James nor Kirkconnell initially shared any additional details about the split, Kirkconnell denied rumors of infidelity when she was approached by TMZ on Jan. 28.
—Jordana Comiter, People.com, 29 Jan. 2025
While the boyfriend's infidelity is undeniable, Moore noted that the OP's decision to check his boyfriend's messages also constitutes a breach of trust.
—Maria Morava, Newsweek, 22 Jan. 2025
See all Example Sentences for infidelity 
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Kyle Khan-Mullins, Forbes, 7 Feb. 2025
The story follows two neighbors, played by Tony Leung Chiu-wai and Maggie Cheung, who form a deep, unspoken connection after suspecting their spouses of infidelity.
—Janey Tracey, EW.com, 7 Feb. 2025
While neither James nor Kirkconnell initially shared any additional details about the split, Kirkconnell denied rumors of infidelity when she was approached by TMZ on Jan. 28.
—Jordana Comiter, People.com, 29 Jan. 2025
While the boyfriend's infidelity is undeniable, Moore noted that the OP's decision to check his boyfriend's messages also constitutes a breach of trust.
—Maria Morava, Newsweek, 22 Jan. 2025
See all Example Sentences for infidelity
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Dictionary Entries Near infidelity
Cite this Entry
“Infidelity.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/infidelity. Accessed 17 Feb. 2025.
Copy CitationKids Definition
infidelity
noun
in·fi·del·i·ty
ˌin-fə-ˈdel-ət-ē
-(ˌ)fī-
plural infidelities
1
: lack of faith in a religion
2
: unfaithfulness especially to one's husband or wife
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