Synonyms for Sourness (same or very similar meaning)
WordNet sense 1 (the taste experience when vinegar or lemon juice is taken into the mouth):
sour, tartnessWordNet sense 2 (the property of being acidic):
acidityWordNet sense 3 (a sullen moody resentful disposition):
moroseness, sulkiness, sullennessFrom the ODE community, based on WordNetadd/edit