Related Clues:

• Churlish
• Roughly built
• Without much intelligence
• Coarse, as language
• Far from polite
• Like Letterman's pet tricks
• Inelegant
• Using one's shirtsleeve as a napkin, e.g.
• Rudely assertive
• Definitely not polite
• Inclined to interrupt, say
• Lacking etiquette
• Lacking culture
• Disrespectful
• Insulting