adjective
ruder; rudest
[also more ~; most ~]
not having or showing concern or respect for the rights and feelings of other people :not polite
relating to sex or other body functions in a way that offends others
always used before a noun :happening suddenly in usually an unpleasant or shocking way
literary :made or done in a simple or rough way :crude
in rude health
Brit old-fashioned :strong and healthy
US