Source : Webster's Revised Unabridged Dictionary (1913)

Incurable \In*cur"a*ble\, n.
   A person diseased beyond cure.

Incurable \In*cur"a*ble\, a. [F. incurable, L. incurabilis. See
   {In-} not, and {Curable}.]
   1. Not capable of being cured; beyond the power of skill or
      medicine to remedy; as, an incurable disease.

            A scirrh is not absolutely incurable. --Arbuthnot.

   2. Not admitting or capable of remedy or correction;
      irremediable; remediless; as, incurable evils.

            Rancorous and incurable hostility.    --Burke.

            They were laboring under a profound, and, as it
            might have seemed, an almost incurable ignorance.
                                                  --Sir J.
                                                  Stephen.

   Syn: Irremediable; remediless; irrecoverable; irretrievable;
        irreparable; hopeless.

Source : WordNet®

incurable
     adj 1: being such that a cure is impossible; "an incurable
            disease"; "an incurable addiction to smoking" [ant: {curable}]
     2: unalterable in disposition or habits; "an incurable
        optimist"
     n : a person whose disease is incurable