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 unfaithfully (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

Despite their apparent passion, Juana's husband Philip was frequently unfaithful to her, his indiscreet affairs causing Juana to fly into rages and periods of depression that provoked the first rumors about Juana's mental state. Lauren Hubbard, Town & Country, "What Was Catherine of Aragon's Sister, Juana la Loca, Really Like?," 10 June 2019 Adultery by a husband might go unpunished, but an unfaithful wife would be executed. National Geographic, "Who was Hammurabi?," 22 Apr. 2019 Her fans are particularly touchy about Jay-Z, who has admitted to being unfaithful to his wife in the past. Martha Ross, The Mercury News, "Beyonce’s publicist tells Beyhive: Stop hating on Nicole Curran," 7 June 2019 Brodie is living in a seaside village, hanging out with his teenage son and taking a few easy jobs: following an unfaithful husband, tracking a possible pedophile online. Jim Kiest, ExpressNews.com, "12 new books for your summer reading list," 5 June 2019 Was Little People, Big World star Matt Roloff unfaithful to Amy with former longtime farm employee Caryn Chandler? Kayla Keegan, Good Housekeeping, "Amy Roloff Got Real About What Went Down Between Matt and Caryn Before Her Divorce," 30 May 2019 Fosse was unfaithful to McCracken with Verdon for several years before the divorce (Wasson tracks the affair back to Damn Yankees), as McCracken’s health was declining due to complications from diabetes. Emma Dibdin, Harper's BAZAAR, "A Complete Timeline of the Real Relationship Between Bob Fosse and Gwen Verdon," 9 Apr. 2019 Though clad in the fashions of the time, the unfaithful wife is Aphrodite, the goddess of love; her handsome paramour is Ares, the god of war; and the outraged husband who has snared the cheating pair in a powerful golden mesh is... Meghan Cox Gurdon, WSJ, "Children’s Books: Love and War as the Meddling Gods Look On," 1 Mar. 2019 This may be, understandably, pretty off-putting, considering the fact that the woman, unfaithful or not, seems to have little say in that matter. Jennifer Wright, Harper's BAZAAR, "The Catholic Church Has No Moral Argument on Abortions," 11 Feb. 2019

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

Statistics for unfaithful

Last Updated

25 Jun 2019

Look-up Popularity

Time Traveler for unfaithful

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

See more words from the same century

Keep scrolling for more

More Definitions for unfaithful



English Language Learners Definition of unfaithful

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


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).


providing supplementary assistance

Get Word of the Day daily email!

Test Your Vocabulary

Farm Idioms Quiz

  • cow coming home
  • What does 'poke' refer to in the expression 'pig in a poke'?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!


Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

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