unfaithful

adjective
un·​faith·​ful | \ ˌən-ˈfāth-fəl How to pronounce unfaithful (audio) \

Definition of unfaithful

: 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

Keep scrolling for more

Other Words from unfaithful

unfaithfully \ ˌən-​ˈfāth-​fə-​lē How to pronounce unfaithful (audio) \ 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 Willy is unfaithful to his wife and has a difficult relationship with his athlete son. Jake Lamar, The New Republic, "August Wilson’s Uncompromising Vision for Ma Rainey’s Black Bottom," 14 Jan. 2021 The first was spurred by an unfaithful elector, and the second began as a challenge from Democrats. Audrey Mcnamara, CBS News, "Electoral College is last long-shot chance for Trump allies to challenge election results," 10 Dec. 2020 On the page left open, Green had written that White was unfaithful. Marc Freeman, sun-sentinel.com, "Woman’s secret marriage to Romanian ended in murder. Killer’s lawyers push insanity defense.," 31 Dec. 2020 Some people who are unfaithful are able to own, apologize for, and rectify their mistake with their partners. Amy Dickinson, chicagotribune.com, "Ask Amy: Cheating boyfriend claims he was hacked," 17 Dec. 2020 Some people who are unfaithful are able to own, apologize for, and rectify their mistake with their partners. Amy Dickinson, Detroit Free Press, "Cheating boyfriend claims he was hacked," 17 Dec. 2020 During their passionate performance, acted out in old-timey dialogue and suggestive dance moves, Bowen plays a jealous woman who is convinced that Wiig, a man, has been unfaithful. Mitchell Peters, Billboard, "Dua Lipa Plays a Nazi-Fighting Homewrecker in 'SNL' WWII Musical Sketch: Watch," 20 Dec. 2020 Some people who are unfaithful are able to own, apologize for, and rectify their mistake with their partners. Amy Dickinson, chicagotribune.com, "Ask Amy: Cheating boyfriend claims he was hacked," 17 Dec. 2020 Some people who are unfaithful are able to own, apologize for, and rectify their mistake with their partners. Amy Dickinson, Detroit Free Press, "Cheating boyfriend claims he was hacked," 17 Dec. 2020

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

See More

First Known Use of unfaithful

15th century, in the meaning defined above

Keep scrolling for more

Learn More about unfaithful

Time Traveler for unfaithful

Time Traveler

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

See more words from the same century

Statistics for unfaithful

Last Updated

11 Feb 2021

Cite this Entry

“Unfaithful.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unfaithful. Accessed 7 Mar. 2021.

Style: MLA
MLA Chicago APA Merriam-Webster

Keep scrolling for more

More Definitions for unfaithful

unfaithful

adjective

English Language Learners Definition of unfaithful

: having a sexual relationship with someone who is not your wife, husband, or partner
: not accurate

unfaithful

adjective
un·​faith·​ful | \ ˌən-ˈfāth-fəl How to pronounce unfaithful (audio) \

Kids Definition of unfaithful

: not faithful : disloyal

Keep scrolling for more

Comments on unfaithful

What made you want to look up unfaithful? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

Test Your Vocabulary

Who Knew?

Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Typeshift

Anagram puzzles meet word search.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!