un·​sub·​stan·​ti·​at·​ed | \ ˌən-səb-ˈstan(t)-shē-ˌā-təd How to pronounce unsubstantiated (audio) \

Definition of unsubstantiated

: not proven to be true : not substantiated an unsubstantiated rumor/report a plausible but unsubstantiated theory

Keep scrolling for more

Examples of unsubstantiated in a Sentence

Recent Examples on the Web Most of Greene’s impeachment filing hinges on unsubstantiated allegations, based on a New York Post story placed last year by Donald Trump’s personal attorney Rudy Giuliani. Erin Corbett, refinery29.com, "Of Course Marjorie Taylor Greene Is Already Trying To Have Biden Impeached," 22 Jan. 2021 In the backdrop, officials were administering an election in the middle of the pandemic that was shrouded by unsubstantiated allegations of voter fraud. Stephen Montemayor, Star Tribune, "Violent threats targeting Minnesota leaders on the rise," 12 Jan. 2021 That effort included meetings between Derkach and President Donald Trump's personal lawyer Rudy Giuliani, who himself has long pushed unsubstantiated allegations about Biden. Eric Tucker, ajc, "US imposes new Ukraine sanctions over election interference," 11 Jan. 2021 Still, raising these objections will give lawmakers—particularly those who are eyeing presidential runs and want to placate Trump’s devoted voters—an opportunity to prove their fealty by echoing his unsubstantiated allegations of voter fraud. Alana Abramson, Time, "Congressional Republicans Won't Overturn Biden's Win. But Their Objections Are Still Dangerous," 5 Jan. 2021 Christie, a long time ally of President Trump despite breaking with him on unsubstantiated allegations of election fraud, has publicly denounced many aspects of the president's attacks on his election loss. Mike Brest, Washington Examiner, "Christie: Continued election challenges are 'very, very dangerous'," 23 Dec. 2020 Barr announced his resignation last week after clashes with the president over the unsubstantiated allegations of election fraud. Editors, USA TODAY, "Trump's Mar-a-Lago trip, possible vaccine deal, holiday traffic: 5 things to know Wednesday," 23 Dec. 2020 The committee, according to the FAA, acknowledges its report contains a number of unsubstantiated allegations. Andy Pasztor, WSJ, "Senate Panel Rebukes FAA in Wake of Boeing 737 MAX Tragedies," 20 Dec. 2020 Giuliani pressured officials to do the investigations and has been pushing unsubstantiated corruption allegations against the Bidens. Michael Balsamo, Anchorage Daily News, "Hunter Biden subpoena seeks info on Burisma, other entities," 13 Dec. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'unsubstantiated.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of unsubstantiated

circa 1775, in the meaning defined above

Keep scrolling for more

Learn More about unsubstantiated

Time Traveler for unsubstantiated

Time Traveler

The first known use of unsubstantiated was circa 1775

See more words from the same year

Statistics for unsubstantiated

Last Updated

26 Feb 2021

Cite this Entry

“Unsubstantiated.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unsubstantiated. Accessed 27 Feb. 2021.

Style: MLA
MLA Chicago APA Merriam-Webster

Keep scrolling for more

More Definitions for unsubstantiated



English Language Learners Definition of unsubstantiated

formal : not proven to be true

More from Merriam-Webster on unsubstantiated

Thesaurus: All synonyms and antonyms for unsubstantiated

Nglish: Translation of unsubstantiated for Spanish Speakers

Comments on unsubstantiated

What made you want to look up unsubstantiated? Please tell us where you read or heard it (including the quote, if possible).


Test Your Vocabulary

February 2021 Words of the Day Quiz

  • squirrel in winter
  • Which is a synonym of perdure?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

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