un·​prov·​en | \ ˌən-ˈprü-vən , British also -ˈprō-\

Definition of unproven

: not tested and shown to be good, true, or useful : not proven an unproven allegation/theory unproven benefits unproven technology

Examples of unproven in a Sentence

Recent Examples on the Web

Venture capital firms know it, giving unproven startups millions of dollars to try to make the best products. Susannah Locke, Vox, "The best of everything," 7 Dec. 2018 In 2011, that figure was about $68 million, meaning companies are paying more for unproven drugs. Charley Grant, WSJ, "What Is Ailing the Drug Industry?," 22 June 2018 The autonomous 16-passenger vehicles zipping through the tunnels at speeds over 100 miles per hour would indeed be the stuff of science fiction, though the Emanuel administration has sought to downplay the more unproven aspects of the project. John Byrne, chicagotribune.com, "Emanuel calls Elon Musk's proposed 12-minute express tunnel to O'Hare 'the fast lane to Chicago's future'," 14 June 2018 The Cougars are unproven at running back behind James Williams and Borghi, so Thomas could take on a Keith Harrington-like role in 2019 — or use his redshirt and slide in next to Borghi as a secondary tailback in 2020. 4. Theo Lawson, The Seattle Times, "NCAA early signing day: These five WSU recruits could make an instant impact for the Cougars," 17 Dec. 2018 The measure going to the White House will expose a larger population of patients to unscrupulous purveyors of unproven treatments and leave them without important protections. Michael Hiltzik, latimes.com, "Giving Koch brothers a big win over patients and the FDA, House sends a right-to-try bill to Trump," 22 May 2018 The motivated presence of Thomas, still one of the game’s pre-eminent free safeties at age 29, would provide a huge boost to a team that already is counting on innumerable unproven young players to step up. Larry Stone, The Seattle Times, "Limbo dance: Seahawks can certainly do without dreaded drama of Earl Thomas holdout," 24 July 2018 Teams are often careful not to overstate their optimism in an unproven player. Zach Berman, Philly.com, "Eagles eager to learn more about quarterback Nate Sudfeld," 26 May 2018 What began as an unproven heart disease theory had come to embody an implicit consumer logic. Jamie Lauren Keiles, Vox, "How low-fat dairy came to rule the US — and why that’s changing.," 20 Dec. 2018

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

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First Known Use of unproven

1563, in the meaning defined above

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Last Updated

6 Feb 2019

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Time Traveler for unproven

The first known use of unproven was in 1563

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English Language Learners Definition of unproven

: not tested and shown to be true, good, or useful


un·​prov·​en | \ ˌən-ˈprü-vən\

Legal Definition of unproven

: not proven an unproven allegation

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Spanish Central: Translation of unproven

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