Incorrigible /(?)/

In·cor·ri·gi·ble

Incorrigible

a.
  1. Not corrigible; incapable of being corrected or amended; bad beyond correction; irreclaimable; as, incorrigible error.

Incorrigible

n.
  1. One who is incorrigible; a person whose persistent bad behavior cannot be changed; especially, a hardened criminal; as, the perpetual imprisonment of incorrigibles; incorrigible and disruptive children need to be placed in a separate classroom.