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
Season 3 also includes the heightened drama of finding out what really happened regarding allegations of Jessi Ngatikaura being unfaithful to her husband and the unraveling of her and some of the other women’s relationship with Demi Engemann, who has had tension with more than a few of them.
—
Lisa Respers France, CNN Money, 11 Nov. 2025
Conrique’s dusky voice effortlessly conveys the emotional distress, before turning the song into one of bravery, as the protagonist leaves the unfaithful lover and then reminds the ex of all the ways those ongoing habits will lead to heartbreak in future relationships.
—Jessica Nicholson, Billboard, 10 Nov. 2025
Both men had allegedly been unfaithful.
—Madison E. Goldberg, PEOPLE, 7 Oct. 2025
There’s a sociological connection between some things that anti-liberals say and some things that certain liberals say, and that’s because certain liberals were unfaithful to their liberalism.
—Isaac Chotiner, New Yorker, 23 Sep. 2025
See All Example Sentences for unfaithful
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Lisa Respers France, CNN Money, 11 Nov. 2025
Conrique’s dusky voice effortlessly conveys the emotional distress, before turning the song into one of bravery, as the protagonist leaves the unfaithful lover and then reminds the ex of all the ways those ongoing habits will lead to heartbreak in future relationships.
—Jessica Nicholson, Billboard, 10 Nov. 2025
Both men had allegedly been unfaithful.
—Madison E. Goldberg, PEOPLE, 7 Oct. 2025
There’s a sociological connection between some things that anti-liberals say and some things that certain liberals say, and that’s because certain liberals were unfaithful to their liberalism.
—Isaac Chotiner, New Yorker, 23 Sep. 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 15 Nov. 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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