Related Clues:

• Not fine
• Pumice, e.g.
• Needing polishing
• Rough-cut
• Rough-hewn
• Churlish
• Smoothing stuff
• Using one's shirtsleeve as a napkin, e.g.
• Crass
• Rubbing the wrong way?
• Lacking etiquette
• Needing refinement
• Like pumice
• Sandpaper-like
• Ill-bred