in ‧ cor ‧ ri ‧ gi ‧ ble /ɪnˈkɒrədʒəb ə l, ɪnˈkɒrɪdʒəb ə l $ -ˈkɔː-/ BrE AmE adjective
[ Date: 1300-1400 ; Language: Late Latin ; Origin: incorrigibilis , from Latin corrigere 'to correct' ]
someone who is incorrigible is bad in a way that cannot be changed or improved – often used humorously
an incorrigible liar/rogue etc
Peter, you are an incorrigible flirt!
—incorrigibly adverb