Adjective : an incurable disease. ,his incurable pessimism.    From Dictionary.com. 

He exaggerates the burden of his sigh, the incurableness of his wounded heart.    From Wordnik.com.  [The Art of Letters] Reference

No time was likely to change the principles of such a man, but his appearance sufficiently betrayed the incurableness of his habits.    From Wordnik.com.  [Edgar Huntly or, Memoirs of a Sleep-Walker] Reference

This is the way to add incurableness to his misery, by tempting him to neglect the only means of taking it off, and so make him miserable without remedy.    From Wordnik.com.  [The Whole Works of the Rev. John Howe, M.A. with a Memoir of the Author. Vol. VI.] Reference

Or this verse may be understood as laying all the blame of the incurableness of their disease upon themselves; and so the question must be answered affirmatively: Is there no balm in.    From Wordnik.com.  [Commentary on the Whole Bible Volume IV (Isaiah to Malachi)] Reference

This is one of the things that has given nervous diseases such a bad name for unmanageableness and incurableness, and that for years made us regard their study as so nearly hopeless, so far as any helpful results were concerned.    From Wordnik.com.  [Preventable Diseases] Reference

She knew full well the incurableness of his depravity; that banishment was the mildest destiny that would befall him; that estrangement from ancient haunts and associates was the condition from which his true friends had least to fear.    From Wordnik.com.  [Edgar Huntly or, Memoirs of a Sleep-Walker] Reference

In truth, Toll had imbibed some of the slang, and much of the boisterousness of the bar-room; but he had not yet given such unequivocal indications of the incurableness of his infirmity, as to induce his acquaintances (who for the most part upheld him on some family consideration) to exclude him from their houses; on the contrary, a certain strain of disorderly but generous companionship, breaking out and shining above.    From Wordnik.com.  [Swallow Barn, or A Sojourn in the Old Dominion. In Two Volumes. Vol. II.] Reference