(of a person) incapable of giving up a reprehensible habit or immoral way of life
2.
incapable of being improved by alteration or correction of abuses
irreformable in American English
(ˌirɪˈfɔrməbəl)
adjective
1.
insusceptible to reforming influences; incorrigible
2.
not subject to improvement; final; perfect
irreformable doctrine
Word origin
[1600–10; ir-2 + reform1 + -able]This word is first recorded in the period 1600–10. Other words that entered Englishat around the same time include: adaptation, alpine, criticism, dolly, umbrella-able is a suffix meaning “capable of, susceptible of, fit for, tending to, given to,”associated in meaning with the word able, occurring in loanwords from Latin (laudable); used in English as a highly productive suffix to form adjectives by addition tostems of any origin (teachable; photographable)