Originally Posted by Elli

Main Entry: incorrigible

Function: adjective
Etymology: Middle English, from Late Latin incorrigibilis, from Latin in- + corrigere to correct -- more at CORRECT
Date: 14th century
: incapable of being corrected or amended: as a (1) : not reformable : DEPRAVED (2) : DELINQUENT b : not manageable : UNRULY c : UNALTERABLE, INVETERATE