asperity
Pronunciation:
/əˈspɛɹɪti//əˈspɛɹɪɾi/noun
Definitions
Roughness as of stone or weather.
Example: the asperity of Maine's winter
Harshness, as of temper.
Something that is harsh and difficult to endure.
A part of a geological fault line that does not move.
Example: Earthquakes begin and end at asperities.