Inveterate
/ɪnˈvɛtəɹɪt/
verb
To fix and settle after a long time; to entrench.
adjective
Firmly established from having been around for a long time; of long standing
“an inveterate disease”
(of a person) Having had a habit for a long time
“an inveterate idler”
Malignant; virulent; spiteful.
Synonyms: chronic, deep-rooted, hardened, ineradicable, ingrained, radicated