(of a person 人 always doing something or enjoying something, and unlikely to stop 积习难改的；有…瘾的 an inveterate liar 积习难改的说谎者 He was an inveterate traveller. 他是个顽固的旅行者。
(of a bad feeling or habit 恶感或陋习 done or felt for a long time and unlikely to change 长期形成的；根深蒂固的 inveterate hostility 根深蒂固的敌意
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’).