nefarious
adjective formal uk/nəˈfeə.ri.əs/ us/nəˈfer.i.əs/
（尤指活动）邪恶的，不道德的
(especially of activities) morally bad
The company's CEO seems to have been involved in some nefarious practices/activities. 公司主管看来曾牵涉一些罪恶勾当。
Synonyms: evil villainous