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
There has been local media chatter about the potential mood in the VIP section, amid unsubstantiated reports that French President Emmanuel Macron has yet to confirm his attendance and does not want to sit next to Vance in light of recent tensions over Greenland.
—
Melanie Goodfellow, Deadline, 5 Feb. 2026
In a court filing last week, Drummond’s office said the lawmakers leveled unsubstantiated attacks at Hiett and other officials but failed to challenge the validity of the fuel-adjustment clause orders themselves.
—Paul Monies, Oklahoma Watch, 3 Feb. 2026
As The Sunday Times reported, there is no indication that the former advisor was aware of the emails or the unsubstantiated allegations.
—Charna Flam, PEOPLE, 31 Jan. 2026
Voting machine companies also have brought defamation cases against some conservative-leaning news sites that aired unsubstantiated claims about their equipment being linked to fraud in 2020.
—Nicholas Riccardi, Los Angeles Times, 29 Jan. 2026
See All Example Sentences for unsubstantiated
Melanie Goodfellow, Deadline, 5 Feb. 2026
In a court filing last week, Drummond’s office said the lawmakers leveled unsubstantiated attacks at Hiett and other officials but failed to challenge the validity of the fuel-adjustment clause orders themselves.
—Paul Monies, Oklahoma Watch, 3 Feb. 2026
As The Sunday Times reported, there is no indication that the former advisor was aware of the emails or the unsubstantiated allegations.
—Charna Flam, PEOPLE, 31 Jan. 2026
Voting machine companies also have brought defamation cases against some conservative-leaning news sites that aired unsubstantiated claims about their equipment being linked to fraud in 2020.
—Nicholas Riccardi, Los Angeles Times, 29 Jan. 2026
See All Example Sentences for unsubstantiated
Recent Examples of Synonyms for unsubstantiated
Adjective
-
There are people who desire to drastically improve the health of our ecosystems who unknowingly struggle with unreasonable expectations.—
Chris McKeown,
Cincinnati Enquirer,
14 Feb. 2026
-
Amid those pressures, many people turn to the comfort of a pet – but the expectations for what dogs can bring to our lives are becoming increasingly unreasonable.—
Margret Grebowicz,
Fortune,
13 Feb. 2026
Adjective
-
Mafi, of Garden Grove Unified, suggested that fear isn’t unfounded.—
Andre Mouchard,
Oc Register,
15 Feb. 2026
-
This is spurious and completely unfounded.—
Letters to the Editor,
The Orlando Sentinel,
14 Feb. 2026
Adjective
-
There are so many reasons to be mad; the mostly baseless and endless attacks on higher education, the dismantling of life-saving research, ICE, the subverting of policy that redresses shameful social harms.—
Wendy Nelson Espeland,
Mercury News,
11 Feb. 2026
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The Talmud teaches that Jerusalem was destroyed not only because of hatred, but because of sinat chinam, baseless hatred fueled by moral absolutism.—
Rabbi Bruce D. Forman,
Sun Sentinel,
10 Feb. 2026
Adjective
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But multiple flood events over the decades have continued to erode the older infrastructure, leaving parts of it unsupported.—
Dante Motley,
Austin American Statesman,
11 Feb. 2026
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But among the litany of possible adverse health outcomes listed, a new analysis in The Lancet published Thursday finds that 62 of those 66 risks are unsupported by reliable evidence.—
Elizabeth Cooney,
STAT,
5 Feb. 2026
Cite this Entry
“Unsubstantiated.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/unsubstantiated. Accessed 20 Feb. 2026.
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