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
Emmy has stood by Will's side throughout it all, especially because he's denied being unfaithful.
—
Dave Quinn, People.com, 27 Feb. 2025
In the present day, Alice, Brett, perfectionistic realtor Catherine (Aja Naomi King) and sloppy socialite Birdie (Melissa Fumero) are garden club buddies dealing with separate personal issues, like dead pets, unfaithful spouses and child custody battles.
—Angie Han, The Hollywood Reporter, 23 Feb. 2025
The New Yorker story alleged that Willingham had a reputation for drinking too much, being unfaithful and physically abusing Stacy.
—Emily Blackwood, People.com, 27 Feb. 2025
Medieval scholars – all men – defined women’s temperament in negative terms: Women were libidinous, frivolous, unfaithful, capricious, unpredictable and easily tempted.
—Joelle Rollo-Koster, The Conversation, 25 Feb. 2025
See All Example Sentences for unfaithful
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Dave Quinn, People.com, 27 Feb. 2025
In the present day, Alice, Brett, perfectionistic realtor Catherine (Aja Naomi King) and sloppy socialite Birdie (Melissa Fumero) are garden club buddies dealing with separate personal issues, like dead pets, unfaithful spouses and child custody battles.
—Angie Han, The Hollywood Reporter, 23 Feb. 2025
The New Yorker story alleged that Willingham had a reputation for drinking too much, being unfaithful and physically abusing Stacy.
—Emily Blackwood, People.com, 27 Feb. 2025
Medieval scholars – all men – defined women’s temperament in negative terms: Women were libidinous, frivolous, unfaithful, capricious, unpredictable and easily tempted.
—Joelle Rollo-Koster, The Conversation, 25 Feb. 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 25 Mar. 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
Love words? Need even more definitions?
Merriam-Webster unabridged
Share