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
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In court Friday, Kazarian said her client suffered from an undiagnosed neurological disorder and may have experienced a seizure at the time of the collision. Clara Harter, Los Angeles Times, 9 May 2026 Sleep apnea thus remains undiagnosed far too often in women and also in other groups. Erika Yamazaki, The Conversation, 6 May 2026 The liver ramps up production of this hs-CRP molecule when the body is under attack or injured, such as when people have undiagnosed cardiovascular issues, infections, or autoimmune diseases like rheumatoid arthritis. Matt Fuchs, Time, 4 May 2026 The series poignantly addresses the complexities of teenage struggles, particularly through Justin’s undiagnosed ADHD and Keisha’s experience of trauma, emphasizing the importance of unconditional support and the intersection of mental health with race and class in today’s world. Brande Victorian, HollywoodReporter, 23 Apr. 2026 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 15 May. 2026.

Medical Definition

undiagnosed

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