Related Clues:

• Not fine
• Needing polishing
• Rough-cut
• Rough-hewn
• Churlish
• Using one's shirtsleeve as a napkin, e.g.
• Crass
• Lacking etiquette
• Needing refinement
• Ill-bred
• Unsuitable for mixed company
• Not polished
• Sandpaper specification
• Unfit for younger ears
• Sandpaperish