confirmed

adjective

(of a person) firmly established in a particular habit, belief, or way of life and unlikely to change their ways.

SYNONYMS

card-carryingchroniccommittedcompulsivededicateddeep-dyeddevoteddyed-in-the-woolestablishedfaithfulfirmfixedhabitualhardenedimpenitentincorrigibleincurableinveterateirredeemablelong-establishedlong-standingloyalobsessivepersistentrootedseasonedsetsettledstalwartstaunchsteadfastthrough and throughunapologeticunashamedunreformable