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
Judge Walgren’s responses to these allegations were measured and appropriate in the face of unsubstantiated allegations.
—
Rafael Perez, Daily News, 7 May 2026
Trump condemned Roberts and the five other justices who ruled against him on tariffs and made an unsubstantiated claim that the court was swayed by foreign interests.
—Andrew Chung, USA Today, 7 May 2026
The $250 million lawsuit alleged that the newspaper irresponsibly reported on Lively’s unsubstantiated allegations.
—Victoria Bekiempis, Vulture, 4 May 2026
The sites mix factual assertions about their targets with unsubstantiated conspiracies and defamatory claims of misconduct ranging from extortion and embezzlement to drug dealing and prostitution.
—Gary Baum, HollywoodReporter, 30 Apr. 2026
See All Example Sentences for unsubstantiated
Rafael Perez, Daily News, 7 May 2026
Trump condemned Roberts and the five other justices who ruled against him on tariffs and made an unsubstantiated claim that the court was swayed by foreign interests.
—Andrew Chung, USA Today, 7 May 2026
The $250 million lawsuit alleged that the newspaper irresponsibly reported on Lively’s unsubstantiated allegations.
—Victoria Bekiempis, Vulture, 4 May 2026
The sites mix factual assertions about their targets with unsubstantiated conspiracies and defamatory claims of misconduct ranging from extortion and embezzlement to drug dealing and prostitution.
—Gary Baum, HollywoodReporter, 30 Apr. 2026
See All Example Sentences for unsubstantiated
Recent Examples of Synonyms for unsubstantiated
Adjective
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However, investing in public institutions and infrastructure is a costly endeavor that can seem unreasonable when local officials are struggling to balance budgets without increasing tax burdens.—
Aneri Pattani,
USA Today,
6 June 2026
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Nineteen recent clinical trials on kratom leaf document no evidence of severe addiction or significant or unreasonable adverse effects.—
Tara Molina,
CBS News,
1 June 2026
Adjective
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Judge Nelson’s concerns are unfounded, as Kalshi and its confederates—Robinhood, Coinbase, and the CFTC—are not relying solely on the 2010 Dodd-Frank Act update to substantiate their claim that the CEA empowers the CFTC to regulate betting on the outcomes of sporting events.—
Daniel Wallach,
Forbes.com,
1 June 2026
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Sacramento County sheriff’s deputies on Friday searched a medical building in Carmichael after receiving what turned about to be unfounded reports of an intruder.—
Rosalio Ahumada,
Sacbee.com,
29 May 2026
Adjective
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This is nothing more than a baseless complaint meant to distract from the Department's mission of keeping dangerous criminals behind bars, despite attempts by activist judges who place politics above public safety.—
Laura Romero,
ABC News,
27 May 2026
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Their accounts, including confrontations with far-right security minister Itamar Ben-Gvir, have drawn international condemnation and diplomatic protests; Israeli prison officials dismiss the allegations as baseless as hundreds of activists are deported.—
Los Angeles Times,
Los Angeles Times,
22 May 2026
Adjective
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According to the report, 71% of those who felt unsupported on productions said safety policies weren’t properly followed.—
Max Goldbart,
Deadline,
28 May 2026
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Many influencers lack formal nutrition credentials and promote unsupported health claims.—
LeeAnn Weintraub,
Oc Register,
27 May 2026
Cite this Entry
“Unsubstantiated.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/unsubstantiated. Accessed 7 Jun. 2026.
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