inveterate
/ɪnˈvetərət/adjective
attrib.
1- having a particular habit, activity, or interest that is long-established and unlikely to change根深蒂固的, 顽固不化的：
he was an inveterate gambler.
他是个积习难改的赌徒。
1.1
- (of a feeling or habit) long-established and unlikely to change（指情感或习惯）根深蒂固的, 成癖的。
派生词
inveteracy
nouninveterately
adverb词源
late 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'）.