A chronic illness or disability lasts for a very long time.
例句
...chronic back pain.慢性背痛
ADJ
難以根除的;積習難改的
You can describe someone's bad habits or behaviour as chronic when they have behaved like that for a long time and do not seem to be able to stop themselves.
例句
Anyone who does not believe that smoking is an addiction has never been a chronic smoker.不相信抽煙能上癮的人肯定不是老煙民。...a chronic worrier.總是憂心忡忡的人
ADJ
(局勢或問題)嚴重的，頑固的
A chronic situation or problem is very severe and unpleasant.
例句
One cause of the artist's suicide seems to have been chronic poverty...那位藝術家自殺的一個原因似乎是極端貧困。There is a chronic shortage of patrol cars in this police district.這個治安轄區嚴重缺乏巡邏車輛。
英英詞典釋義
Adverb
1. in a habitual and long-standing manner;
"smoking chronically"
2. in a slowly developing and long lasting manner;