means The quality of having an uneven, coarse, or jagged surface or texture, or by extension a lack of smoothness in manner, sound, or treatment.

from From "rough," which traces back to Old English "ruh" — meaning hairy, coarse, or shaggy — with the noun-forming suffix "-ness" that turns a quality into a thing you can name. "Ruh" has Germanic cousins, like Dutch "ruw" and German "rauh," all clustered around the same idea of something bristly and unfinished to the touch.