in·​fi·​del·​i·​ty | \ ˌin-fə-ˈde-lə-tē How to pronounce infidelity (audio) , -(ˌ)fī- \
plural infidelities

Definition of infidelity

1a : 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 And while Evans shared photos of the couple enjoying an outing at the beach after the filing, that video of him accusing her of infidelity was released soon after. Essence, 24 Nov. 2021 Parnell did not directly address the allegation of infidelity. Sara Murray And Michael Warren, CNN, 9 Nov. 2021 That’s what happens with infidelity: Because so much is left unsaid, a person can make all kinds of faulty assumptions. Lori Gottlieb, The Atlantic, 14 Dec. 2020 Spears' veil of virginity began to end during her relationship with teen heartthrob Justin Timberlake, especially when rumours began to spread that the two had split because of infidelity on Spears' part. Danielle Campoamor,, 2 July 2021 Following a breakup with TLC’s Chili, Usher released a concept album that, in part, focused on infidelity. Troy L. Smith, cleveland, 28 Sep. 2021 Hurt partners not knowing about infidelity stifles opportunities for the couple to seek support and does not afford opportunity for partners to move forward. Annie Lane, oregonlive, 27 Sep. 2021 Managers should avoid behaving like a jealous boyfriend or girlfriend, constantly checking on their partner and being suspicious of them, which is more likely to create than stop infidelity. Tomas Chamorro-premuzic, Forbes, 2 Sep. 2021 That’s the question that vexes Hidetoshi Nishijima’s venerated theater actor, who tries to come to terms with his wife’s infidelity by directing a multilingual production of Uncle Vanya … with her young lover in the lead role. Rachel Handler, Vulture, 20 July 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'infidelity.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of infidelity

15th century, in the meaning defined at sense 2

History and Etymology for infidelity

Middle English infidelite, borrowed from Middle French infidelité, borrowed from Latin infidēlitāt-, infidēlitās "faithlessness, inconstancy," from infidēlis "unfaithful, disloyal" + -itāt-, -itās -ity — more at infidel entry 2

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The first known use of infidelity was in the 15th century

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Last Updated

1 Dec 2021

Cite this Entry

“Infidelity.” Dictionary, Merriam-Webster, Accessed 1 Dec. 2021.

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More from Merriam-Webster on infidelity

Nglish: Translation of infidelity for Spanish Speakers

Britannica English: Translation of infidelity for Arabic Speakers


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