Source : Webster's Revised Unabridged Dictionary (1913)

Incorruptible \In"cor*rupt"i*ble\, a. [L. incorruptibilis: cf.
   F. incorruptible. See {In-} not, and {Corrupt}.]
   1. Not corruptible; incapable of corruption, decay, or
      dissolution; as, gold is incorruptible.

            Our bodies shall be changed into incorruptible and
            immortal substances.                  --Wake.

   2. Incapable of being bribed or morally corrupted; inflexibly
      just and upright.

Incorruptible \In"cor*rupt"i*ble\, n. (Eccl. Hist.)
   One of a religious sect which arose in Alexandria, in the
   reign of the Emperor Justinian, and which believed that the
   body of Christ was incorruptible, and that he suffered
   hunger, thirst, pain, only in appearance.

Incorruptible \In"cor*rupt"i*ble\, n.
   The quality or state of being incorruptible. --Boyle.

Source : WordNet®

incorruptible
     adj : incapable of being morally corrupted; "incorruptible judges
           are the backbone of the society"