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
These examples are automatically compiled from online sources to illustrate current usage. Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
In several of his personal attacks on Harris, including the reference to drinking, Trump appeared to be referencing falsehoods or unsubstantiated claims spreading online in far-right circles. Jill Colvin, Fortune, 23 Oct. 2024 Shannon Eddy, executive director of the Large-Scale Solar Assn., who supported exploring listing the owls, said the petitioners made unsubstantiated claims about the effect of solar projects on the species. Lila Seidman, Los Angeles Times, 14 Oct. 2024 In the aftermath, FEMA's disaster response has been the subject of many false claims and unsubstantiated rumors. Andre Byik, USA TODAY, 10 Oct. 2024 In September, Vance repeatedly amplified unsubstantiated rumors about Haitians stealing and eating Springfield residents’ pets. Dan Mangan,kevin Breuninger,annie Nova,rebecca Picciotto,josephine Rozzelle,brian Schwartz,ece Yildirim, CNBC, 1 Oct. 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 5 Nov. 2024.

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!