undiagnosed

adjective

un·​di·​ag·​nosed ˌən-ˌdī-ig-ˈnōst 

-əg-,

-zd

: not diagnosed : not identified through diagnosis

an undiagnosed illness

… the symptoms of the syndrome may be subtle and thus may remain undiagnosed.

—Dwight R. Robinson

a condition that often goes undiagnosed

Examples of undiagnosed in a Sentence

Recent Examples on the Web

Commonly known as fatty liver disease, the illness often goes undiagnosed until a patient has progressed to permanent scarring and damage to the liver, called cirrhosis. —Nina Agrawal, New York Times, 11 Feb. 2025

But her symptoms, which at this point were still undiagnosed, were still mostly a secret. —Hedy Phillips, People.com, 11 Jan. 2025

There’s also her nearly lifelong struggle with Lyme disease (which was undiagnosed for decades), the hate mail and random abuse her ideas and stances have earned, and, of course, being physically attacked by Courtney Love at Lollapalooza in 1995. —Jem Aswad, Variety, 17 Dec. 2024

While further research is necessary, this may be why more autistic women are undiagnosed. —Caitlin Pagán, Verywell Health, 17 Oct. 2024

Word History

First Known Use

1864, in the meaning defined above

Medical Definition

undiagnosed

adjective

un·​di·​ag·​nosed -ˈnōst 

: not diagnosed : eluding diagnosis

undiagnosed disease