Noah Webster
Smoothness
SMOOTH'NESS, noun
1. Evenness of suface; freedom from roughness or asperity; as the smoothness of a floor or wall; smoothness of the skin; smoothness of the water.
2. Softness or mildness to the palate; as the smoothness of wine.
3. Softness and sweetness of numbers; easy flow of words. Virgil, though smooth where smoothness is required, is far from affecting it.
4. Mildness or gentleness of speech; blandness of address.