Incorrigible means beyond any hope of being reformed. An incorrigible liar, incorrigible optimism, quite incorrigible.
It is often affectionate: an incorrigible flirt or an incorrigible optimist is being teased rather than condemned. In older legal use it was serious and meant somebody the system had given up on, which is a much darker sense.
1adjectiveincorrigibleBeyond any hope of being reformed.
“My uncle is an incorrigible liar, and nobody believes his stories anymore.”
incorrigible is a quality.
Latin incorrigibilis, in-, not, plus corrigere, to correct — com plus regere, to guide.
Latin
incorrigibilis — not to be corrected
Middle French
incorrigible
Middle English
incorrigible
English, today
incorrigible
From Middle English incorrigible, from Middle French incorrigible (1334), or directly from Latin incorrigibilis (“not to be corrected”), from in- + corrigere + -ibilis, equivalent to in- + corrigible. Recorded since 1340.
Etymology from Wiktionary, CC BY-SA