12 letters · 17 points in Scrabble
adjective impervious to correction by punishment
originFrom Middle English incorrigible, from Middle French incorrigible (1334), or directly from Latin incorrigibilis (“not to be corrected”), from in- (“not”) + corrigere (“to correct”) + -ibilis (“-able”), equivalent to in- + corrigible. Recorded since 1340.
Etymology from Wiktionary, CC BY-SA 3.0