After several rehab programs, he was still considered a recidivist at the drug treatment center.

recidivist 是由拉丁词根 recidivus（意为"再次犯罪"）加上后缀 -ist（表示"从事某种行为的人"）构成的名词。这个词专指"惯犯、累犯"，特别是指那些屡次犯罪或重复某种不良行为的人。