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
For years, unsubstantiated speculation circulated publicly tying Smith’s death to members of the Murdaugh family.
—
Stepheny Price, FOXNews.com, 11 Mar. 2026
Hungarian Prime Minister Viktor Orbán doubled down Monday on an unsubstantiated claim that Ukraine is deliberately holding back shipments of Russian oil, and accused Kyiv of seeking to topple his government.
—Sam McNeil, Arkansas Online, 24 Feb. 2026
Hungarian Prime Minister Viktor Orbán doubled down Monday on an unsubstantiated allegation that Ukraine is deliberately holding back shipments of Russian oil, and accused Kyiv of seeking to topple his government.
—ABC News, 23 Feb. 2026
As Shell retreated to handle the fallout with his family, other claims that arose of inappropriate behavior by the exec proved unsubstantiated.
—Dominic Patten, Deadline, 23 Feb. 2026
See All Example Sentences for unsubstantiated
Stepheny Price, FOXNews.com, 11 Mar. 2026
Hungarian Prime Minister Viktor Orbán doubled down Monday on an unsubstantiated claim that Ukraine is deliberately holding back shipments of Russian oil, and accused Kyiv of seeking to topple his government.
—Sam McNeil, Arkansas Online, 24 Feb. 2026
Hungarian Prime Minister Viktor Orbán doubled down Monday on an unsubstantiated allegation that Ukraine is deliberately holding back shipments of Russian oil, and accused Kyiv of seeking to topple his government.
—ABC News, 23 Feb. 2026
As Shell retreated to handle the fallout with his family, other claims that arose of inappropriate behavior by the exec proved unsubstantiated.
—Dominic Patten, Deadline, 23 Feb. 2026
See All Example Sentences for unsubstantiated
Recent Examples of Synonyms for unsubstantiated
Adjective
-
As in Williams’ case, attorneys argued that a sweep had violated the plaintiffs’ Fourth Amendment rights protecting them from unreasonable search and seizure, as well as their 14th Amendment right to due process.—
Ariane Lange,
Sacbee.com,
24 Mar. 2026
-
Because that is ultimately what The Secret Garden is about—the stubborn, almost unreasonable insistence of living things to grow toward the light.—
Literary Hub,
Literary Hub,
23 Mar. 2026
Adjective
-
Local election officials told the county Board of Supervisors last month that the complaint was unfounded.—
ABC News,
ABC News,
31 Mar. 2026
-
The lesion that was removed from his brain is from the part of the brain that causes moments of unfounded fear.—
Gary Bedore,
Kansas City Star,
29 Mar. 2026
Adjective
-
At the time, LGBTQ+ advocates slammed the suit as baseless and damaging.—
Brittny Mejia,
Los Angeles Times,
26 Mar. 2026
-
Compounding that volume, legal workers say, is a disorienting veneer of legibility that AI can bring to flawed or baseless arguments.—
Maggie Harrison Dupré,
Futurism,
18 Mar. 2026
Adjective
-
Many taller sleepers struggle with standard mattress lengths that leave their feet unsupported.—
Jason Phillips,
USA Today,
25 Mar. 2026
-
Filing incorrect income information or claiming unsupported credits can delay refunds and potentially lead to penalties.—
Kurt Knutsson,
FOXNews.com,
12 Mar. 2026
Cite this Entry
“Unsubstantiated.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/unsubstantiated. Accessed 2 Apr. 2026.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
