Sourness

Just looking at a lemon makes one feel the sourness in one's mouth.

The proportion of sugar used for making cherry pie will, of course, need to be varied according to the sourness of the cherries used.

[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.