undiagnosed

adjective

un·​di·​ag·​nosed ˌən-ˌdī-ig-ˈnōst How to pronounce undiagnosed (audio)
-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
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.
At 13, Rodrigues lost her sister, Tiffany, to an undiagnosed heart disease. Stephanie Nolasco, FOXNews.com, 6 Sep. 2025 Skinner is back in the United States, and in New York City with nothing but a backpack and baggie of anti-anxiety meds, after yet another tour of duty in the Middle East, and clearly dealing with undiagnosed PTSD and self-medicating with alcohol. Ryan Lattanzio, IndieWire, 5 Sep. 2025 But a comprehensive review of research on autistic adults over the age of 40 paints a very different picture, showing that autism spans older generations, with as many as 90% of cases going undiagnosed. New Atlas, 1 Sep. 2025 But that spring, my mental health wasn’t in a good place thanks to the volatile combination of two years of pandemic lockdown, switching my antidepressants, my undiagnosed ADHD and a horrible case of writer's block. Alison Cochrun, People.com, 31 Aug. 2025 See All Example Sentences for undiagnosed

Word History

First Known Use

1864, in the meaning defined above

Time Traveler
The first known use of undiagnosed was in 1864

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Cite this Entry

“Undiagnosed.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/undiagnosed. Accessed 10 Sep. 2025.

Medical Definition

undiagnosed

adjective
un·​di·​ag·​nosed -ˈnōst How to pronounce undiagnosed (audio)
: not diagnosed : eluding diagnosis
undiagnosed disease
Last Updated: - Updated example sentences
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