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.
But an outside agency such as the Texas Rangers would not have access to unsubstantiated claims of misconduct by jailers when investigating a death in the Tarrant County jail. Cody Copeland, Fort Worth Star-Telegram, 16 Apr. 2025 The statement served as a pointed rebuke to a president who had continued to make unsubstantiated allegations of voting fraud while Trump's legal team pursued multiple legal challenges in battleground states. Josh Meyer, USA Today, 9 Apr. 2025 Stocks briefly rose yesterday on unsubstantiated reports that the administration might pause the tariffs for 90 days. German Lopez, New York Times, 8 Apr. 2025 In light of all of this, biotech companies should be prepared to clearly articulate how their innovations translate into clinical outcomes, rather than relying on broad, unsubstantiated claims. Niven R. Narain, Forbes.com, 31 Mar. 2025 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

Browse Nearby Words

Cite this Entry

“Unsubstantiated.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unsubstantiated. Accessed 24 Apr. 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!