unsubstantiated
adjective
un·sub·stan·ti·at·ed
ˌən-səb-ˈstan(t)-shē-ˌā-təd 
: not proven to be true : not substantiated
an unsubstantiated rumor/report
a plausible but unsubstantiated theory
Examples of unsubstantiated in a Sentence
an unsubstantiated claim that was thrown out of court
Recent Examples on the Web
The $250 million lawsuit alleged that the newspaper irresponsibly reported on Lively’s unsubstantiated allegations.
—
Victoria Bekiempis, Vulture, 4 May 2026
The sites mix factual assertions about their targets with unsubstantiated conspiracies and defamatory claims of misconduct ranging from extortion and embezzlement to drug dealing and prostitution.
—Gary Baum, HollywoodReporter, 30 Apr. 2026
Two weeks later, a Telegram channel claiming to represent the group made an unsubstantiated claim of responsibility for an arson attack on four Jewish ambulances in Golders Green, north London.
—The Week Uk, TheWeek, 29 Apr. 2026
Multiple women came forward with detailed and serious allegations—including specific claims of drugging, rape, and assault—relatively quickly after initial reports, suggesting a verifiable pattern rather than mere unsubstantiated rumor.
—Los Angeles Times, 17 Apr. 2026
See All Example Sentences for unsubstantiated
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Victoria Bekiempis, Vulture, 4 May 2026
The sites mix factual assertions about their targets with unsubstantiated conspiracies and defamatory claims of misconduct ranging from extortion and embezzlement to drug dealing and prostitution.
—Gary Baum, HollywoodReporter, 30 Apr. 2026
Two weeks later, a Telegram channel claiming to represent the group made an unsubstantiated claim of responsibility for an arson attack on four Jewish ambulances in Golders Green, north London.
—The Week Uk, TheWeek, 29 Apr. 2026
Multiple women came forward with detailed and serious allegations—including specific claims of drugging, rape, and assault—relatively quickly after initial reports, suggesting a verifiable pattern rather than mere unsubstantiated rumor.
—Los Angeles Times, 17 Apr. 2026
See All Example Sentences for unsubstantiated
Cite this Entry
“Unsubstantiated.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unsubstantiated. Accessed 6 May. 2026.
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