rudeHe made a rude remark about the staff.
impoliteShe asks direct questions without being in any way impolite.
cheekyUKYou asked your teacher how old she was? That was a bit cheeky!
disrespectfulThe class was very disrespectful towards the new teacher.
impertinentIt was clear that they found his questions impertinent.
insolentWhat an ungrateful, insolent child!
impudentShe made an impudent remark to her manager.
uncouthdisapprovingShe considers him loud-mouthed and uncouth.
vulgarHe told a rather vulgar joke over dinner.
crudeDon't be so crude in front of the children.