unfaithful

adjective

un·​faith·​ful ˌən-ˈfāth-fəl How to pronounce unfaithful (audio)
: not faithful:
a
: not adhering to vows, allegiance, or duty : disloyal
an unfaithful friend
b
: not faithful to marriage vows
suspected her husband of being unfaithful
c
: inaccurate, untrustworthy
an unfaithful copy of a document
unfaithfully adverb
unfaithfulness noun

Examples of unfaithful in a Sentence

colonists who later proved to be unfaithful to the cause of independence
Recent Examples on the Web The video features a devastated-looking Timberlake invading the home of his unfaithful ex-girlfriend, who bears a resemblance to Spears. Martha Ross, The Mercury News, 5 Mar. 2024 That is, until Dexter—fresh off a divorce from his unfaithful first wife Sylvie (Eleanor Tomlinson), the mother of his daughter Jasmine (Billie Gadsdon)—visits Emma in Paris to declare his feelings for her. Megan McCluskey, TIME, 8 Feb. 2024 Every relationship is unique, but more and more research is being done into the emotional rationale behind being unfaithful to one’s partner. Emma Specter, Vogue, 21 Mar. 2024 Washington will play the title character, while Gyllenhaal will portray the antagonist Iago, who tries to convince Othello that his wife has been unfaithful. Rebecca Rubin, Variety, 6 Mar. 2024 See all Example Sentences for unfaithful 

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'unfaithful.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

15th century, in the meaning defined above

Time Traveler
The first known use of unfaithful was in the 15th century

Dictionary Entries Near unfaithful

Cite this Entry

“Unfaithful.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unfaithful. Accessed 21 Jun. 2024.

Kids Definition

unfaithful

adjective
un·​faith·​ful ˌən-ˈfāth-fəl How to pronounce unfaithful (audio)
ˈən-
1
: not observing vows, allegiance, or duty : disloyal
an unfaithful friend
2
: not faithful to marriage vows
3
: inaccurate
an unfaithful translation
unfaithfully adverb
unfaithfulness noun

More from Merriam-Webster on unfaithful

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