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
Chang’s unsubstantiated speculation that Doremus might have been texting coworkers on her way to work was insufficient.
—
Dan Eaton, San Diego Union-Tribune, 18 May 2026
Its meetings at times became chaotic venues for casting doubt and airing unsubstantiated claims, often unchallenged, on the safety and efficacy of vaccines.
—Jesse L. Goodman, STAT, 18 May 2026
Olsen’s work in the government—following years of pushing debunked or unsubstantiated theories—helped lead to the seizure of the Georgia ballots.
—Shane Harris, The Atlantic, 14 May 2026
Overwhelmingly, those cases stem from reports later found to be false or unsubstantiated.
—James R Mason, Hartford Courant, 12 May 2026
See All Example Sentences for unsubstantiated
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Dan Eaton, San Diego Union-Tribune, 18 May 2026
Its meetings at times became chaotic venues for casting doubt and airing unsubstantiated claims, often unchallenged, on the safety and efficacy of vaccines.
—Jesse L. Goodman, STAT, 18 May 2026
Olsen’s work in the government—following years of pushing debunked or unsubstantiated theories—helped lead to the seizure of the Georgia ballots.
—Shane Harris, The Atlantic, 14 May 2026
Overwhelmingly, those cases stem from reports later found to be false or unsubstantiated.
—James R Mason, Hartford Courant, 12 May 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 20 May. 2026.
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