UNFAITHFUL Synonyms: 65 Similar and Opposite Words

unfaithful

adjective

ˌən-ˈfāth-fəl

Definition of unfaithful

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

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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 In Strangers on a Train, Rogers played Guy's unfaithful wife, whom Bruno offers to kill. — Emily Blackwood, PEOPLE, 29 June 2026 Platner is also an unfaithful spouse who mistreats women. — Chris Roemer, Baltimore Sun, 25 June 2026 Starring Yakusho Koji, the film follows a man released on parole after killing his unfaithful wife. — Naman Ramachandran, Variety, 13 May 2026 See All Example Sentences for unfaithful

Recent Examples of Synonyms for unfaithful

Adjective

Telemachus’ lone contribution is killing Melanthius, the traitorous Ithacan farmhand, thus preventing him from continuing to arm the suitors.

— Marlow Stern, Variety, 17 July 2026
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

Definition of traitorous

Adjective

Quarterback LaNorris Sellers, receiver Nyck Harbor and defensive end Dylan Stewart are rare specimens, yet each has been inconsistent and unreliable.

— Edgar Thompson, The Orlando Sentinel, 8 Oct. 2026
Fuel is costly and polluting, and the generators provide limited, unreliable power.

— ABC News, ABC News, 6 Oct. 2026

Definition of unreliable

Adjective

Some defendants face additional allegations involving false claims of citizenship or fraudulent statements that rest on separate federal statutes.

— Antonio María Delgado, Miami Herald, 6 Oct. 2026
Those numbers include 759 false identification cards confiscated, 378 alcohol-possession-by-a-minor violations and 98 fake-ID citations during the calendar-year reporting period, according to Oxford Police.

— Kelsie Cairns, FOXNews.com, 6 Oct. 2026

Definition of false

Adjective

That, granted, was a brief if treacherous gut check, giving way to a re-expansion of valuations and a march to new highs through 2019 right up until Covid struck.

— Michael Santoli, CNBC, 6 Oct. 2026
Taking the route around the Horn of Africa rather than going through the now-treacherous Bab el-Mandab Strait and on through the Suez Canal adds millions to overall costs.

— David Faris, Washington Post, 5 Oct. 2026

Definition of treacherous

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unfaith

unfaithful

unfaithfulness

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“Unfaithful.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/unfaithful. Accessed 13 Oct. 2026.

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Synonyms of unfaithful

adjective

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