not suitable, simple, dignified or beautiful; not in the style preferred by the upper classes of society

a vulgar patterned shirt 图案粗俗的衬衫

Isn't it rather vulgar to talk about how much money you earn? 谈论挣多少钱难道不庸俗吗？

humorous I've no idea how much the clothes cost because there was nothing so vulgar as a price tag in evidence. 我不知道那些衣服值多少钱，因为上面连一个普通的价签都看不到。

rude and likely to upset or anger people, especially by referring to sex and the body in an unpleasant way

It was an extremely vulgar joke. 那是个极为下流的笑话。