Definition of inveterate adjective from the Oxford Advanced Learner's Dictionary



    BrE BrE//ɪnˈvetərət//
    ; NAmE NAmE//ɪnˈvetərət//
    [usually before noun] (formal, often disapproving)
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  1. 1(of a person) always doing something or enjoying something, and unlikely to stop an inveterate liar He was an inveterate traveller.
  2. 2(of a bad feeling or habit) done or felt for a long time and unlikely to change inveterate hostility
  3. Word Originlate Middle English (referring to disease, in the sense ‘of long standing, chronic’): from Latin inveteratus ‘made old’, past participle of inveterare (based on vetus, veter- ‘old’).
See the Oxford Advanced American Dictionary entry: inveterate