Noun
Roughness of surface; unevenness; -- opposed to smoothness.
Roughness or harshness of sound; that quality which grates upon the ear; raucity.
Roughness to the taste; sourness; tartness.
Moral roughness; roughness of manner; severity; crabbedness; harshness; -- opposed to mildness.
Sharpness; disagreeableness; difficulty.
Source: Webster's dictionaryVenerate four characters: the sanguine who has checked volatility and the rage for pleasure; the choleric who has subdued passion and pride; the phlegmatic emerged from indolence; and the melancholy who has dismissed avarice, suspicion and asperity. Johann Kaspar Lavater
Manfred was not one of those savage tyrants who wanton in cruelty unprovoked. The circumstances of his fortune had given an asperity to his temper, which was naturally humane; and his virtues were always ready to operate, when his passions did not obscure his reason. Horace Walpole
the asperity of northern winters Source: Internet
When the debate is getting excessively heated, it is open to a member to move "that the Standing Order on Asperity of Speech be read by the Clerk". Source: Internet