asperity Look up asperity at Dictionary.com
early 13c., asprete "harshness of feelings," a fig. use, from O.Fr. asperete (12c., Mod.Fr. âpreté), from L. asperitatem (nom. asperitas) "roughness," from asper "rough, harsh," of unknown origin; in L. used also of sour wine, bad weather, and hard times.