unfaithful

adjective

ˌən-ˈfāth-fəl How to pronounce unfaithful (audio)
Definition of unfaithfulnext
as in traitorous
not true in one's allegiance to someone or something colonists who later proved to be unfaithful to the cause of independence

Synonyms & Similar Words

Relevance

Antonyms & Near Antonyms

Example Sentences

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.
Recent Examples of unfaithful The golden calf famously enraged Moses, showing that the Israelites had turned away from God and were unfaithful in Moses’s absence. — Britta Miller, The Washington Examiner, 9 May 2026 Portraits of him as a cheating drunk, who was unfaithful to his first wife, Julia Nye, also surfaced. — Kory Grow, Rolling Stone, 6 May 2026 Speculation immediately followed surrounding what caused their beak-up, including that Keoghan was unfaithful. — Jessica Schladebeck, New York Daily News, 28 Apr. 2026 This story isn't nearly as exciting because an NBA player being unfaithful to his girlfriend sort of just feels like a regular Thursday afternoon. — Amber Harding Outkick, FOXNews.com, 28 Apr. 2026 See All Example Sentences for unfaithful
Recent Examples of Synonyms for unfaithful
  1. traitorous
  2. unreliable
  3. false
  4. faithless
  5. disloyal
  6. treacherous
Adjective
  • And at the very center of Hell is Satan himself, the traitorous Archangel Lucifer, depicted as a monstrous creature with wings and three heads.
    — Keith Cooper, Space.com, 11 May 2026
  • Russell fabricates a lie with the rest of the villains, and the heroes believe it, despite a warning from one traitorous tribemate.
    — Literary Hub, Literary Hub, 5 Dec. 2025
Definition of traitorous
Adjective
  • Voters are paying for aging, dirty and unreliable coal plants that often aren’t even running or working.
    — David Kieve, Time, 10 July 2026
  • When buses are slow and unreliable, those burdens fall disproportionately on these communities.
    — Mike Flynn, New York Daily News, 9 July 2026
Definition of unreliable
Adjective
  • An infusion of false hope, however, is all the equalizer was.
    — Tom Krasovic, San Diego Union-Tribune, 8 July 2026
  • Her post received 22,000 likes, and Elon Musk—who regularly boosts white-supremacist perspectives—and Joe Rogan have made similar claims about the group being a false-flag operation.
    — Ali Breland, The Atlantic, 8 July 2026
Definition of false
Adjective
  • The French had said the British were faithless.
    — Literary Hub, Literary Hub, 20 May 2026
  • Consumed by rage and betrayal, Eleanor is driven to take a bloody, supernatural revenge upon her faithless husband.
    — Robert Lang, Deadline, 27 Dec. 2025
Definition of faithless
Adjective
  • What This Moment Is Actually About Gen Zers aren't disloyal, lazy or unreasonable for wanting job security.
    — Vince Carrabba, Forbes.com, 8 July 2026
  • But back in February when the court ruled against him on tariffs, the president held an angry White House press conference, calling the conservative justices who sided against him disloyal among other insults.
    — Tamara Keith, NPR, 1 July 2026
Definition of disloyal
Adjective
  • Currently, ocean data are gathered using massive research vessels that cannot safely navigate treacherous shallow reefs or breaking ice.
    — Mrigakshi Dixit, Interesting Engineering, 9 July 2026
  • Projecting forward four years in this game is always treacherous, more so now than following the 2022 World Cup.
    — Tom Bogert, New York Times, 9 July 2026
Definition of treacherous

Browse Nearby Words

unfaith
unfaithful
unfaithfulness
See all Nearby Words

Cite this Entry

“Unfaithful.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/unfaithful. Accessed 12 Jul. 2026.

Copy Citation

More from Merriam-Webster on unfaithful

Nglish: Translation of unfaithful for Spanish Speakers

Last Updated: - Updated example sentences
Love words? Need even more definitions?

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

More from Merriam-Webster

Word of the Day

Listen to the pronunciation of fulcrum

See Definitions and Examples »

Popular in Grammar & Usage

See More

Is that lie 'bald-faced' or 'bold-faced'?

'A' or 'an'? What about before 'h'? An Indefinite Article Guide

Why is '-ed' sometimes pronounced at the end of a word?

Commonly Misspelled Words

How to Use Em Dashes (—), En Dashes (–) , and Hyphens (-)
See More

Popular in Wordplay

See More

14 Phobias You Probably Haven't Heard Of

The Longest Long Words List

One-Word Oxymorons: Bittersweet, Spendthrift, and More

Ten Words Ending with a Silent ‘T’

The Words of the Week - Jul 10
See More

Popular

See More

Is that lie 'bald-faced' or 'bold-faced'?

14 Phobias You Probably Haven't Heard Of

The Longest Long Words List
See More

Games & Quizzes

See All
Play Quordle: Guess all four words in a limited number of tries. Each of your guesses must be a real 5-letter word.
Quordle Can you solve 4 words at once?
Play Blossom: Solve today's spelling word game by finding as many words as you can using just 7 letters. Longer words score more points.
Blossom Pick the best words!
Play Missing Letter: a crossword with a twist. Each of the 25 puzzle words start with a different letter of the alphabet. Which letter is missing?
The Missing Letter A daily crossword with a twist
banana-mirrored
Contradictory Words Quiz Pick out which word means one thing…and the opp...
See All