inveterate

adj. /ɪnˈvetərət/ C2

积习难改的；根深蒂固的

Doing something as a deep-rooted, long-established habit.

仙境例句

The Dormouse was an inveterate sleeper; he even slept through his own story.

睡鼠是个改不了的瞌睡虫，连讲自己的故事都会睡着。