Incorrigible
Middle English: from Old French, or from Latin incorrigibilis, from in- ‘not’ + corrigibilis (see corrigible).
wiktionary
From 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”). Recorded since 1340.
etymonline
incorrigible (adj.)
mid-14c., "incurable (of diseases, venom, etc.); extravagant (of expense); implacable (of hearts)," from Old French incorrigible "perfect, beyond rebuke or discipline" (14c.) or directly from Latin incorrigibilis "not to be corrected," from in- "not, opposite of" (see in- (1)) + corrigibilis, from corrigere "to correct," from com-, intensive prefix (see com-), + regere "to lead straight, rule" (from PIE root *reg- "move in a straight line," with derivatives meaning "to direct in a straight line," thus "to lead, rule"). From mid-15c. as "incapable of improvement" (of persons). Related: Incorrigibly. As a noun, from 1746.
