inveterate
adj. US //ˌɪnˈvɛtɝət// UK //ɪnvˈɛtəɹˌeɪt// in·vet·er·ate
The adjective is first attested in 1528, the verb in 1574; borrowed from Latin inveterātus (“of long standing, chronic”), perfect passive participle of inveterō and participial adjective (see -ate (verb-forming suffix) and -ate (adjective-forming suffix)), from in- (“in, into”) + veterō (“to age”), from vetus, veteris (“old”). Cognate with Italian inveterato, French invétéré.