unsubstantiated

adjective

un·​sub·​stan·​ti·​at·​ed ˌən-səb-ˈstan(t)-shē-ˌā-təd How to pronounce unsubstantiated (audio)
: 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
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.
These have been debunked, but Kirillov's death sparked the re-emergence of the same unsubstantiated talking points. Dan Perry, Newsweek, 18 Dec. 2024 That year, Trump pursued unsuccessful lawsuits to overturn the election results in battleground states, alleging unsubstantiated voting irregularities. Karissa Waddick, USA TODAY, 6 Nov. 2024 However, police and researchers have cautioned that these reports are still unsubstantiated. Will Carless, USA TODAY, 20 Dec. 2024 The city’s Civilian Complaint Review Board exonerated her in one instance and deemed all of the other allegations either unfounded or unsubstantiated. Shayla Colon, New York Times, 11 Dec. 2024 See all Example Sentences for unsubstantiated 

Word History

First Known Use

circa 1775, in the meaning defined above

Time Traveler
The first known use of unsubstantiated was circa 1775

Dictionary Entries Near unsubstantiated

Cite this Entry

“Unsubstantiated.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unsubstantiated. Accessed 2 Jan. 2025.

More from Merriam-Webster on unsubstantiated

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!