coarse; crude (in one's manner); boorish

surname Lu; Lu, an ancient state of China 魯國|鲁国[Lu3 guo2]; short name for Shandong 山東|山东[Shan1 dong1]

(bound form) crass; stupid; rude; (used to represent the sounds of "ru", "lu" etc in loanwords)

Yale

Peru