as in unreasonable
having no basis in reason or fact
an unsubstantiated claim that was thrown out of court
Synonyms & Similar Words
Relevance
Antonyms & Near Antonyms
Example Sentences
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Recent Examples of unsubstantiated
Yoon’s conservative supporters have latched on to his arguments as well as his unsubstantiated claims of election fraud, strongly echoing the dynamic between President Donald Trump and supporters who say he has been wrongly persecuted by a corrupt judicial system.
—
Beomsu Jo, NBC News, 8 Mar. 2025
This week, Cornett was the center of unsubstantiated speculation that spread widely online.
—David Chiu, People.com, 28 Feb. 2025
The wildly generous estimates of Ukrainian mineral deposits that are presented in some writings of around $26 trillion are quite unsubstantiated.
—Saleem H. Ali, Forbes, 25 Feb. 2025
On several occasions, Trump has made unsubstantiated claims that the Biden administration held up Williams and Wilmore's return due to political reasons.
—NBC News, 19 Mar. 2025
See All Example Sentences for unsubstantiated
Beomsu Jo, NBC News, 8 Mar. 2025
This week, Cornett was the center of unsubstantiated speculation that spread widely online.
—David Chiu, People.com, 28 Feb. 2025
The wildly generous estimates of Ukrainian mineral deposits that are presented in some writings of around $26 trillion are quite unsubstantiated.
—Saleem H. Ali, Forbes, 25 Feb. 2025
On several occasions, Trump has made unsubstantiated claims that the Biden administration held up Williams and Wilmore's return due to political reasons.
—NBC News, 19 Mar. 2025
See All Example Sentences for unsubstantiated
Recent Examples of Synonyms for unsubstantiated
Adjective
-
The words were harsh but the logic was not unreasonable.—
George Caulkin,
The Athletic,
24 Mar. 2025
-
This would not be an unreasonable proposition, considering the U.S. already pledged a security guarantee to Ukraine upon its return of all nuclear warheads to Russia by 1996, based on the Budapest Memorandum on Security Assurances.—
Seung-Whan Choi,
Chicago Tribune,
23 Mar. 2025
Adjective
-
The United Way said her claim was unfounded and raised issues about her work performance.—
Tyler Whetstone,
USA Today,
1 Apr. 2025
-
In a statement, the Russian embassy said the allegations of interference in the lawmaker’s case were unfounded and unacceptable.—
Reuters,
CNN Money,
31 Mar. 2025
Adjective
-
Absent a raft of unsupported PCs operating as honey traps for hackers and malware, this one-of-a-kind hardware refresh is coming.—
Zak Doffman,
Forbes.com,
3 Apr. 2025
-
Zoom in: Reports that the CDC will conduct a new large-scale study to look into already unsupported claims of a link between autism and vaccines are raising concern about political influence.—
Alison Snyder,
Axios,
24 Mar. 2025
Cite this Entry
“Unsubstantiated.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/unsubstantiated. Accessed 16 Apr. 2025.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share