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

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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 Nyong’o also plays Clytemnestra, the unfaithful wife of Agamemnon, whom Clytemnestra and her lover, Aegisthus, murder. — Encyclopedia Britannica, 1 July 2026 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 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
  • Employees quickly abandon systems that are slow, unreliable or difficult to use.
    — Damini Sood, Forbes.com, 2 July 2026
  • But weak charging infrastructure, limited and unreliable electricity supply outside major cities, and high financing costs could constrain widespread adoption on the continent, even as investors race to build out infrastructure.
    — Jenny Vaughan, semafor.com, 1 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
  • 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
  • The party has found a kind of rhythm, where the president breaks fundraising records, spreads the wealth around, and, in return, gets to humiliate disloyal Republicans in seats that the party can’t lose.
    — David Weigel, semafor.com, 1 July 2026
Definition of disloyal
Adjective
  • The infamous cyclops briefly appeared, as well as footage of Odysseus and his men battling the cannibalistic race of giants known as Laestrygonians and navigating around the treacherous whirlpool Charybdis.
    — Jennifer Ouellette, ArsTechnica, 1 July 2026
  • According to the hiking blog, The Hiking HI, the rock bridge can only be traversed at low tide, but can be treacherous either way.
    — Sam Gillette, PEOPLE, 30 June 2026
Definition of treacherous

Browse Nearby Words

unfaith
unfaithful
unfaithfulness
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Cite this Entry

“Unfaithful.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/unfaithful. Accessed 9 Jul. 2026.

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More from Merriam-Webster on unfaithful

Nglish: Translation of unfaithful for Spanish Speakers

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