sourness

noun

Etymology: From Middle English sowrenesse, sournesse, from Old English sūrnes (“sourness”), equivalent to sour + -ness.

1. The condition or quality of being sour.

   “[O]ur Tympanouſe ſtatiſts / (In their affected grauitie of voice, / Sovverneſſe of countenance, maners crueltie, / Authoritie, vvealth, and all the ſpavvne of Fortune) / Thinke they beare all the kingdomes vvorth before them; […]”

   “Mrs. Ferrars was a little, thin woman, upright, even to formality, in her figure, and serious, even to sourness, in her aspect.”