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undiagnosed

British  
/ ˌʌndaɪəɡˈnəʊzd /

adjective

  1. (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

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The results suggest that hypertension remains widely undiagnosed, untreated, or inadequately managed, even though it is a major contributor to stroke, heart disease, and premature death.

From Science Daily ● Oct. 2, 2026

"A year ago today, while playing soccer, I collapsed due to an undiagnosed cardiac arrhythmia, that caused me to go into cardiac arrest," she wrote.

From BBC ● Sep. 17, 2026

The mum-of-two from Church Village, Rhondda Cynon Taf, said she had navigated postnatal depression, anxiety and undiagnosed neurodivergence over the last few years, but gardening had offered her hope.

From BBC ● Aug. 30, 2026

Patients, doctors and nurses are turning to the technology for help identifying rare and undiagnosed diseases.

From The Wall Street Journal ● Aug. 18, 2026

A week passed, during which a bulletin from the Government Health Service announced official suspicion that the human race was suffering a mysterious, pandemic affliction which was as yet undiagnosed.

From Mate in Two Moves by Winston K. Marks

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