unfaithful
adjective
un·faith·ful
ˌən-ˈfāth-fəl 
: 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
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
Duggar claims the government used a statement posted to his family's Facebook page and attributed to him claiming Duggar had secretly viewed pornography, led a double-life and had been unfaithful to his wife.
—
Arkansas Online, 29 July 2025
In My Good Side, the Vanderpump Rules alum, 40, opened up about how her husband admitted to being unfaithful amid the fallout of Rachel Leviss' cheating scandal with Tom Sandoval in 2023, which prompted the end of the latter's nine-year relationship with Ariana Madix.
—Ilana Kaplan, People.com, 22 July 2025
The pair is accused of having been caught being unfaithful.
—Marni Rose McFall, MSNBC Newsweek, 21 July 2025
Such partners, especially men with this trait, were also more suspicious of their own partners being unfaithful to them.
—Mark Travers, Forbes.com, 19 July 2025
See All Example Sentences for unfaithful
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Arkansas Online, 29 July 2025
In My Good Side, the Vanderpump Rules alum, 40, opened up about how her husband admitted to being unfaithful amid the fallout of Rachel Leviss' cheating scandal with Tom Sandoval in 2023, which prompted the end of the latter's nine-year relationship with Ariana Madix.
—Ilana Kaplan, People.com, 22 July 2025
The pair is accused of having been caught being unfaithful.
—Marni Rose McFall, MSNBC Newsweek, 21 July 2025
Such partners, especially men with this trait, were also more suspicious of their own partners being unfaithful to them.
—Mark Travers, Forbes.com, 19 July 2025
See All Example Sentences for unfaithful
Cite this Entry
“Unfaithful.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unfaithful. Accessed 7 Aug. 2025.
Copy CitationKids Definition
unfaithful
adjective
un·faith·ful
ˌən-ˈfāth-fəl
ˈən-
1
: not observing vows, allegiance, or duty : disloyal
an unfaithful friend
2
: not faithful to marriage vows
3
: inaccurate
an unfaithful translation
unfaithfulness
noun
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