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
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
Importantly, Miller says monkey barring is fundamentally different from polyamory — while the latter refers to loving multiple people at once and requires the consent of everyone involved, the former is arguably a form of infidelity.
—
Nicole Fallert, USA Today, 19 Sep. 2025
And finances consistently rank among the top two causes of divorce—right alongside infidelity.
—Essence, 19 Sep. 2025
In the debut episode of Ned’s new podcast, Rock Bottom, the pair will have their first public conversation about Ned’s infidelity since the cheating scandal broke in 2022.
—Luke Chinman, PEOPLE, 16 Sep. 2025
What the audience will get to do is decide the ending of the opera — a comedy about mistaken identity, suspicious lovers and infidelity.
—Sal Pizarro, Mercury News, 13 Sep. 2025
See All Example Sentences for infidelity
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Nicole Fallert, USA Today, 19 Sep. 2025
And finances consistently rank among the top two causes of divorce—right alongside infidelity.
—Essence, 19 Sep. 2025
In the debut episode of Ned’s new podcast, Rock Bottom, the pair will have their first public conversation about Ned’s infidelity since the cheating scandal broke in 2022.
—Luke Chinman, PEOPLE, 16 Sep. 2025
What the audience will get to do is decide the ending of the opera — a comedy about mistaken identity, suspicious lovers and infidelity.
—Sal Pizarro, Mercury News, 13 Sep. 2025
See All Example Sentences for infidelity
Cite this Entry
“Infidelity.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/infidelity. Accessed 20 Sep. 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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