Source : Webster's Revised Unabridged Dictionary (1913)

Incorruptibility \In`cor*rupt`i*bil"i*ty\, n. [L.
   incorruptibilitas: cf. F. incorruptibilit['e].]
   The quality of being incorruptible; incapability of
   corruption. --Holland.

Source : WordNet®

incorruptibility
     n : the incapability of being corrupted [ant: {corruptibility}]