adjective
Defective and impossible to materially correct or set aright.
Unmanageable; impervious to correction by punishment or pain.
Incurably depraved; not reformable.
Unchangeably established in a belief or habit.
(philosophy, of a proposition or belief) Intrinsically incapable of being corrected; impossible to disprove, by its very nature.
(archaic, of a disease) Impossible to cure.
noun
An incorrigibly bad individual.