Asperity

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