Definitions

1. noun

The quality or state of being sour; a feeling of unpleasantness or dissatisfaction.

“The sourness of the lemon made her pucker her lips.”

2. noun

A sour taste, smell, or sensation.

“The sourness of the cheese was a major turn-off.”

3. noun

A lack of freshness or a feeling of staleness.

“The sourness of the air was a result of the stagnant water.”