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
1
as in infidelity
lack of faithfulness especially to one's husband or wife
he eventually forgave his wife's unfaithfulness
Synonyms & Similar Words
Antonyms & Near Antonyms
2
as in betrayal
the act or fact of violating the trust or confidence of another
the jaw-dropping unfaithfulness of the person she had considered her best friend was deeply hurtful
Synonyms & Similar Words
Antonyms & Near Antonyms
3
as in adultery
a sexual encounter or relationship between a married person and someone other than their spouse
there were charges of unfaithfulness on both sides
Synonyms & Similar Words
Antonyms & Near Antonyms
Example Sentences
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Recent Examples of unfaithful
Amber Harding Outkick, FOXNews.com, 28 Apr. 2026
Upon discovering that her abusive husband (Caleb Landry Jones) had been unfaithful, Becky drove off with her parents' car and shot at the door of his mistress' apartment.
—Drew MacKie, PEOPLE, 11 Apr. 2026
Chris Willman, Variety, 12 June 2026
According to The Daily Mail, unfaithfulness might have been the cause.
—Lizzie Lanuza, StyleCaster, 12 Jan. 2026
See All Example Sentences for unfaithful
Adjective
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
Upon discovering that her abusive husband (Caleb Landry Jones) had been unfaithful, Becky drove off with her parents' car and shot at the door of his mistress' apartment.
—Drew MacKie, PEOPLE, 11 Apr. 2026
Noun
Coming to the glum realization that love isn’t outlasting infatuation is trickier to write about than a more incendiary subject like unfaithfulness, but Rodrigo pulls it off.
—Chris Willman, Variety, 12 June 2026
According to The Daily Mail, unfaithfulness might have been the cause.
—Lizzie Lanuza, StyleCaster, 12 Jan. 2026
See All Example Sentences for unfaithful
Recent Examples of Synonyms for unfaithful
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
Adjective
-
Elders still literally freeze in winter because energy is unreliable or unaffordable.—
Cody Two Bears,
Rolling Stone,
17 June 2026
-
The president and his advisers have repeatedly criticized offshore wind as intermittent, unreliable and unsightly.—
Los Angeles Times,
Los Angeles Times,
17 June 2026
Adjective
-
According to the department, at the time of the chase, Buban had multiple outstanding arrest warrants against him, including for being a felon in possession of a firearm, taking a vehicle without consent, false impersonation and petty theft.—
Kassia Bonesteel,
CBS News,
19 June 2026
-
According to Peña, a producer relayed the false information to her through an earpiece during a live broadcast.—
Nicole Acevedo,
NBC news,
19 June 2026
Adjective
-
The French had said the British were faithless.—
Literary Hub,
Literary Hub,
20 May 2026
-
When this inquiry was relayed to the Trump Administration, one Administration official told me last month, it was interpreted as a signal that Anthropic, which was then renegotiating its own contract with the federal government, was perhaps a faithless partner.—
Gideon Lewis-Kraus,
New Yorker,
15 Apr. 2026
Adjective
-
For some, public criticism of the nation can feel disloyal or disrespectful.—
Maia Niguel Hoskin,
Forbes.com,
18 June 2026
-
For that independence, he is increasingly treated as a disloyal outcast by members of his own party, who continue trying to push him out of the tent.—
Doug Friednash,
Denver Post,
3 June 2026
Adjective
-
The terrain can be treacherous, but the guide offered patience and grace for our entire group, slowing down without comment when someone was straggling and prioritizing water breaks.—
Condé Nast,
Condé Nast Traveler,
17 June 2026
-
Shinnecock’s fairways create optical illusions off the tee, the bunkering is treacherous and the greens are, in some places, designed to repel the ball from the putting surfaces.—
Gabby Herzig,
New York Times,
16 June 2026
Cite this Entry
“Unfaithful.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/unfaithful. Accessed 24 Jun. 2026.
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