NOUN (1)

1. a person whose disease is incurable;


ADJECTIVE (2)

1. incapable of being cured;
- Example: "an incurable disease"
- Example: "an incurable addiction to smoking"

2. unalterable in disposition or habits;
- Example: "an incurable optimist"

The Collaborative International Dictionary of English v.0.48:

Incurable \In*cur"a*ble\, a. [F. incurable, L. incurabilis. See
   In- not, and Curable.]
   [1913 Webster]
   1. Not capable of being cured; beyond the power of skill or
      medicine to remedy; as, an incurable disease.
      [1913 Webster]

            A scirrhus is not absolutely incurable. --Arbuthnot.
      [1913 Webster]

   2. Not admitting or capable of remedy or correction;
      irremediable; remediless; as, incurable evils.
      [1913 Webster]

            Rancorous and incurable hostility.    --Burke.
      [1913 Webster]

            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.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Incurable \In*cur"a*ble\, n.
   A person diseased beyond cure.
   [1913 Webster]

WordNet (r) 3.0 (2006):

incurable
    adj 1: incapable of being cured; "an incurable disease"; "an
           incurable addiction to smoking" [ant: curable]
    2: unalterable in disposition or habits; "an incurable optimist"
    n 1: a person whose disease is incurable