Definitions for "Asperity"
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.
Sharpness; disagreeableness; difficulty.
Keywords:  stuck, fault, area
An area on a fault that is stuck.
something hard to endure; "the asperity of northern winters"