Definify.com
Webster 1913 Edition
Sourness
Sour′ness
,Noun.
 The quality or state of being sour. 
Webster 1828 Edition
Sourness
SOUR'NESS
, n.1.
  Acidity; sharpness to the taste; tartness; as the sourness of vinegar or of fruit.  Sourness being one of those simple ideas which one cannot describe.2.
  Asperity; harshness of temper.  Take care that no sourness and moroseness mingle with our seriousness of mind.Definition 2025
sourness
sourness
English
Noun
sourness (plural sournesses)
-  The quality or condition of being sour, usually said of human personalities.
- 1811 Mrs. Ferrars was a little, thin woman, upright, even to formality, in her figure, and serious, even to sourness , in her aspect. — Jane Austen, Sense and Sensibility, Chapter 2.1.
 
Translations
quality or condition