A crude person is someone who is rude, obnoxious, and generally unpleasant. The term can be broken down into four words: BOOR (4 letters), LOUT (4 letters), SLOB (4 letters), and YAHOO (5 letters). A BOOR is someone who is ill-mannered and insensitive to the feelings of others. A LOUT is someone who is uncouth and rough in their behavior. A SLOB is someone who is untidy and careless in their habits. Finally, a YAHOO is someone who is uncivilized and lacks refinement. All of these terms describe someone who is crude and unpleasant.