Asperity

Asperity: Asperity derives its various meanings metaphorically from a Latin root meaning rough. Asperity might be a rough manner (severe), or a rough surface, or a rough temper (irritable). Asperity shares its etymology with exasperate.

... Johnson's weaknesses, real and alleged - his indolence, his oddities and asperity of manner, his excesses in eating and drinking, his profanity and bawdy, his sexual lapses, his intellectual narrowness and prejudice, his use of drugs, his insanity ...

A Book for Today: Samuel Johnson by Jeffrey Meyers