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
The deportations – part of a program Iran announced in March – radically increased in the days after Iran’s conflict with Israel, fueled by unsubstantiated claims that Afghans had spied for Israel prior to and during the attacks.
—
Rhea Mogul, CNN Money, 20 Aug. 2025
Trump cited a letter from Federal Housing Finance Agency head Bill Pulte that encouraged Attorney General Pam Bondi to investigate Cook over unsubstantiated claims of fraud related to two mortgages.
—Dave Goldiner, New York Daily News, 20 Aug. 2025
The president on Monday revived his years-long and unsubstantiated charges that voting by mail leads to election fraud, advocating the elimination of mail-in ballots in states, along with the use of voting machines.
—Kristina Karisch, The Hill, 19 Aug. 2025
In subsequent social media posts and in comments to reporters, Trump has made unsubstantiated claims about the BLS process for conducting and revising jobs reports and the political motivations of McEntarfer in order to benefit Democrats and undermine Republicans.
—Isabella Murray, ABC News, 5 Aug. 2025
See All Example Sentences for unsubstantiated
Rhea Mogul, CNN Money, 20 Aug. 2025
Trump cited a letter from Federal Housing Finance Agency head Bill Pulte that encouraged Attorney General Pam Bondi to investigate Cook over unsubstantiated claims of fraud related to two mortgages.
—Dave Goldiner, New York Daily News, 20 Aug. 2025
The president on Monday revived his years-long and unsubstantiated charges that voting by mail leads to election fraud, advocating the elimination of mail-in ballots in states, along with the use of voting machines.
—Kristina Karisch, The Hill, 19 Aug. 2025
In subsequent social media posts and in comments to reporters, Trump has made unsubstantiated claims about the BLS process for conducting and revising jobs reports and the political motivations of McEntarfer in order to benefit Democrats and undermine Republicans.
—Isabella Murray, ABC News, 5 Aug. 2025
See All Example Sentences for unsubstantiated
Recent Examples of Synonyms for unsubstantiated
Adjective
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The Justice Department in its June 2024 report on problems with policing in Phoenix found that police delayed medical assistance to people who appeared to be incapacitated as a result of the use of force by officers and used unreasonable force on people who had already been wounded by officers.—
Elena Santa Cruz,
AZCentral.com,
3 Sep. 2025
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Investors had initially feared that ASDA’s undercuts would lead to market leaders Tesco and Sainsbury’s having to lower prices to an unreasonable point in order to maintain their market shares.—
John Choong,
Forbes.com,
1 Sep. 2025
Adjective
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The letter follows the ouster of CDC director Susan Monarez just one month into her tenure after a disagreement over vaccine policy with Kennedy, a vaccine skeptic who has promoted a controversial and unfounded theory that links vaccines to autism.—
Swapna Venugopal Ramaswamy,
USA Today,
4 Sep. 2025
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Brazil’s top electoral court has already banned Bolsonaro from running in elections until 2030 over abuse of power while in office and casting unfounded doubts on the country’s electronic voting system.—
CNN Money,
CNN Money,
2 Sep. 2025
Adjective
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Stephen King recently spoke to The Times UK and criticized Hollywood’s superhero movies for often depicting baseless violence.—
Zack Sharf,
Variety,
4 Sep. 2025
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In response to questions from The Tennessean, a Google spokesperson said the accusations are baseless and mischaracterize Google’s security functions.—
Angele Latham,
The Tennessean,
30 Aug. 2025
Adjective
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By the time financial results reflect the decline, the underlying issue—namely, an overextended and unsupported CEO—has already taken root.—
Julian Hayes II,
Forbes.com,
31 Aug. 2025
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Eager, but unsupported Gen Z approaches AI with both enthusiasm and anxiousness.—
Nick Lichtenberg,
Fortune,
29 Aug. 2025
Cite this Entry
“Unsubstantiated.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/unsubstantiated. Accessed 8 Sep. 2025.
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