(1):
(n.) Roughness to the taste; sourness; tartness.
(2):
(n.) Moral roughness; roughness of manner; severity; crabbedness; harshness; - opposed to mildness.
(3):
(n.) Sharpness; disagreeableness; difficulty.
(4):
(n.) Roughness or harshness of sound; that quality which grates upon the ear; raucity.
(5):
(n.) Roughness of surface; unevenness; - opposed to smoothness.