A rude person can be described as a BOOR (4 letters), CHURL (5 letters), starer (6 letters), ASS (3 letters), GOOP (4 letters), or SNIP (4 letters). A BOOR is someone who is ill-mannered and insensitive to the feelings of others. A CHURL is someone who is surly and unfriendly. A starer is someone who stares at people in an impolite manner. An ASS is someone who is foolish and inconsiderate. A GOOP is someone who is clumsy and awkward. Finally, a SNIP is someone who is short-tempered and irritable.