Source : Webster's Revised Unabridged Dictionary (1913)

Roughness \Rough"ness\, n.
   The quality or state of being rough.

Source : WordNet®

roughness
     n 1: a texture that is not smooth but is irregular and uneven
          [ant: {smoothness}]
     2: harsh or rough to the ear [syn: {harshness}]
     3: an unpolished unrefined quality; "the crudeness of frontier
        dwellings depressed her" [syn: {crudeness}]
     4: used of the sea [syn: {choppiness}, {rough water}]
     5: rowdy behavior [syn: {rowdiness}, {rowdyism}, {disorderliness}]
     6: the formation of small pits in a surface as a consequence of
        corrosion [syn: {pitting}, {indentation}]