noun
intractable disease; serious illness
Refers to a disease that is difficult to cure or treat, often used in medical, legal, and social welfare contexts. In Japan, it frequently appears in the term 難病指定 (designated intractable disease).
彼は難病と長年闘っている。
He has been battling an intractable disease for many years.
A cure for the intractable disease has not yet been established.