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 mall was previously evacuated in years past for a nearby fire and an unsubstantiated threat.
—
Sarah Bahari, Dallas Morning News, 25 Mar. 2026
But unsubstantiated rumors of Netanyahu’s death continued to spread, with TikTokers and meme accounts analyzing subsequent posts from his account.
—Angela Yang, NBC news, 18 Mar. 2026
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
See All Example Sentences for unsubstantiated
Sarah Bahari, Dallas Morning News, 25 Mar. 2026
But unsubstantiated rumors of Netanyahu’s death continued to spread, with TikTokers and meme accounts analyzing subsequent posts from his account.
—Angela Yang, NBC news, 18 Mar. 2026
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
See All Example Sentences for unsubstantiated
Recent Examples of Synonyms for unsubstantiated
Adjective
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Another avenue for the administration is to invoke a section of the Trade Act of 1974 that allows tariffs against countries for unreasonable or discriminatory trade practices.—
Judith Kohler,
Denver Post,
7 May 2026
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And to be fair to Rivers, many people wondered aloud if Green was being unreasonable, incorrect, delusional or all of the above.—
Zach Harper,
New York Times,
7 May 2026
Adjective
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The common assumption that, one way or another, the strait will reopen when the crisis ends is unfounded.—
Robert Kagan,
The Atlantic,
10 May 2026
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Although an inquiry by the National Oceanic and Atmospheric Administration was closed, stating that the allegation of his removal and transport of the whale head was unfounded, the absence of a detailed public explanation still leaves the ethical questions unresolved.—
Sam Zeveloff,
STAT,
9 May 2026
Adjective
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Bianco also faces scrutiny for seizing more than 650,000 election ballots in what critics call a baseless fraud investigation.—
Hailey Wang,
Los Angeles Times,
9 May 2026
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In a new legal filing, obtained by Fox News Digital, Lively's legal team argued that Baldoni's dismissed $400 million defamation case was not only baseless but retaliatory.—
Lauryn Overhultz,
FOXNews.com,
7 May 2026
Adjective
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Voicer Peter McCarthy is the typical Trumptard, launching accusations unsupported by any facts.—
Voice of the People,
New York Daily News,
3 May 2026
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What hurts me most is feeling unsupported by my partner.—
Abigail Van Buren,
Boston Herald,
30 Apr. 2026
Cite this Entry
“Unsubstantiated.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/unsubstantiated. Accessed 12 May. 2026.
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