Related Clues:

• Rough, as sandpaper
• Damaging, in a way
• Pumice, e.g.
• Like the wind
• Tending to wear down
• Smoothing stuff
• Rubbing the wrong way?
• Like waves on a shoreline
• Wearing like wind or water
• Like pumice
• Like waves on a shore
• Sandpaper-like
• Tending to wash out
• Causing disintegration
• Naturally wearing down