as in unreasonable
having no basis in reason or fact
an unsubstantiated claim that was thrown out of court
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Recent Examples of unsubstantiated
Russia’s unsubstantiated claims that NATO is plotting armed provocations against Transnistria could be a pretext for Moscow’s meddling in Moldova, raising concerns about further military aggression in the region.
—
Brendan Cole, MSNBC Newsweek, 25 Sep. 2025
Their reporting is full of unsubstantiated claims and clearly aims at destroying the agency which, at its heart, has provi[ded] education and health care in place where no one else actually wants to work with a group of people that is one of the most vulnerable in the region.
—Benjamin Weinthal, FOXNews.com, 19 Sep. 2025
These are unsubstantiated allegations.
—Sam Gillette, PEOPLE, 19 Sep. 2025
Andrew Caballero-Reynolds / AFP via Getty Images Yet, that has not prevented people from calling for justice for Reed on social media and circulating unsubstantiated allegations regarding his death.
—Daniella Silva, NBC news, 16 Sep. 2025
See All Example Sentences for unsubstantiated
Brendan Cole, MSNBC Newsweek, 25 Sep. 2025
Their reporting is full of unsubstantiated claims and clearly aims at destroying the agency which, at its heart, has provi[ded] education and health care in place where no one else actually wants to work with a group of people that is one of the most vulnerable in the region.
—Benjamin Weinthal, FOXNews.com, 19 Sep. 2025
These are unsubstantiated allegations.
—Sam Gillette, PEOPLE, 19 Sep. 2025
Andrew Caballero-Reynolds / AFP via Getty Images Yet, that has not prevented people from calling for justice for Reed on social media and circulating unsubstantiated allegations regarding his death.
—Daniella Silva, NBC news, 16 Sep. 2025
See All Example Sentences for unsubstantiated
Recent Examples of Synonyms for unsubstantiated
Adjective
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Importantly, the president already has full legal authority to impose tariffs when other nations’ behavior places an unreasonable burden on our economy, including through environmental negligence.—
Chip Lamarca,
Sun Sentinel,
6 Jan. 2026
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The logic was that Spirit had projected the league would grow at a rate that the league itself found unreasonable, and so would not be able to field a team while also paying Rodman.—
Louisa Thomas,
New Yorker,
4 Jan. 2026
Adjective
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The start of the trial in Paris comes three months after Brigitte and her husband sued right-wing American podcaster Candace Owens for making similar unfounded allegations about Brigitte's gender on a public platform.—
Rachel Raposas,
PEOPLE,
29 Oct. 2025
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The Lone Star State is no stranger to conspiracy theories – from baseless claims that cloud seeding caused deadly floods last July to unfounded fears that a routine military training exercise in 2015 was a secret plot to impose martial law in Texas and confiscate firearms.—
Dalia Faheid,
CNN Money,
27 Oct. 2025
Adjective
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The papers were studying strokes in animals, and researchers not only found duplicate images but also a lack of follow-up research, another red flag pointing to baseless findings.—
Tom Chivers,
semafor.com,
7 Nov. 2025
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The Lone Star State is no stranger to conspiracy theories – from baseless claims that cloud seeding caused deadly floods last July to unfounded fears that a routine military training exercise in 2015 was a secret plot to impose martial law in Texas and confiscate firearms.—
Dalia Faheid,
CNN Money,
27 Oct. 2025
Adjective
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The collapse was likely the result of a leaking water line that washed out the soil underneath and left the pavement unsupported.—
Kris Habermehl,
CBS News,
22 Dec. 2025
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Critics said the idea was unsupported and could mislead parents.—
Gabe Whisnant,
MSNBC Newsweek,
5 Dec. 2025
Cite this Entry
“Unsubstantiated.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/unsubstantiated. Accessed 9 Jan. 2026.
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