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unsubstantiated

American  
[uhn-suhb-stan-shee-ey-tid] / ˌʌn səbˈstæn ʃiˌeɪ tɪd /

adjective

  1. not substantiated; unproved or unverified.

    unsubstantiated allegations.

  2. being without form or substance.

unsubstantiated British  
/ ˌʌnsəbˈstænʃɪˌeɪtɪd /

adjective

  1. not established as valid or genuine

    unsubstantiated allegations
"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of unsubstantiated

First recorded in 1765–75; un- 1 + substantiate + -ed 2

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

We identified more than 200 separate ads appearing to make unsubstantiated health claims, most of which had been posted by individual salons or smaller chains.

From BBC

Those rumors are unsubstantiated and the government extended the concessions, beginning in 2023, for another 25 years.

From The Wall Street Journal

She is also in a quarrel with Erika Kirk over unsubstantiated claims of a conspiracy involving the US and Israeli governments in the killing of her husband.

From Barron's

South Africa's home affairs department described these accusations as "unsubstantiated".

From BBC

Paul's fights are frequently accompanied by unsubstantiated claims they are "scripted".

From BBC

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.