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undiagnosed

British

/ ˌʌndaɪəɡˈnəʊzd /

adjective

(of a medical condition, a problem, etc) not having been identified

"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

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.

As a kid with learning differences, whose undiagnosed dyslexia put him behind in school.

From Los Angeles Times • Mar. 4, 2026

Controllable endemic diseases like high blood pressure will be undiagnosed and ignored until paralysis sets in.

From MarketWatch • Jan. 26, 2026

Currently, many young people go undiagnosed and risk developing a life-threatening complication called diabetic ketoacidosis that needs urgent hospital treatment.

From BBC • Jan. 20, 2026

They say that the universal recommendation for hepatitis B shots protects infants whose mothers have an undiagnosed hepatitis B infection, or who are exposed to hepatitis B in the first weeks of their lives.

From Barron's • Dec. 5, 2025

This trouble might have gone on some time longer undiagnosed if we had not met our first modern national emergency in 1917.

From The Coming of Coal by Bruere, Robert W.

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