Definition of sourness noun from the Oxford Advanced Learner's Dictionary

     

    sourness

     noun
    noun
    BrE BrE//ˈsaʊənəs//
     
    ; NAmE NAmE//ˈsaʊərnəs//
     
    [uncountable]
     
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  1. 1a taste like that of a lemon or of fruit that is not ready to eat the sourness of the fruit opposite sweetness (2)
  2. 2an unpleasant taste or smell, especially of milk, because it is not fresh He sniffed the milk for a hint of sourness.
  3. 3the quality of not being cheerful; the quality of being bad-tempered and unpleasant his increasing sourness