Related Clues:

• Rough, as sandpaper
• Like some sandpaper
• Not fine
• Rough-cut
• Rough-hewn
• Churlish
• Using one's shirtsleeve as a napkin, e.g.
• Crass
• Lacking etiquette
• Needing refinement
• Ill-bred
• Lacking social graces
• Unsuitable for mixed company
• Not polished
• Sandpaper specification