incorrigible
in-KOR-ih-juh-buladjMeaning impossible to correct or reform; always misbehaving
Memory hook NOT CORRECT-able. Farmer Jamal has told the goat “No!” a hundred times, but it still eats the socks off his line; it cannot be corrected. The goat is incorrigible.
Our incorrigible parrot still squawks at the mail carrier every single morning.
In context Teachers had tried praise, extra chores and long talks, but the class clown remained incorrigible, cracking jokes all the way through every test.
Similar unruly, hopeless, unreformable, incurable
Opposite obedient, manageable, reformable
From Late Latin incorrigibilis: in- (not) + corrigere (to correct).