To be notorious means to be well known for something bad. 声名狼藉的
adjective [原级] 声名狼藉的,臭名昭著的
an area notorious for drugs, crime and violence. … 一个因毒品、犯罪和暴力而声名狼藉的地区。
adverb [方式副词] 声名狼藉地
The train company is overstaffed and notoriously inefficient. 这家铁路公司人员超编,且出了名地没有效率。
not(知道) + orious(多的) → 人所共知的 → 声名狼藉的
(a notorious criminal / area / bend in the road)