incurable disease
incurable illness

She is the daughter of a rich businessman, but has an incurable disease.

It is difficult to learn that you will be fully disabled with an incurable disease.

"Do you want me to work on solving some incurable disease while I'm at it?"

On the other hand, here's something that addresses an incurable disease for which the best available therapy is poor.

He owns a total of 155, and says, "I have an incurable disease."

And what is his prescription for the incurable disease from which we may be recovering?

He's fighting to cure his little sister of an incurable disease.

"What have I got, some kind of incurable disease or something?"

Just as if he'd been shot to pieces or got some incurable disease.

Just what part of "incurable disease" do they not understand?