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not comparable
(of a disease or condition) That had not been diagnosed. quotations examples
After the accident, a sleep study identified that the GBRf driver had previously undiagnosed severe Obstructive Sleep Apnoea.
2023 August 23, “Network News: RAIB cites driver fatigue as factor in 28mph collision”, in RAIL, number 990, page 12
simple past and past participle of undiagnose examples