Definition of sweetness noun from the Oxford Advanced American Dictionary

     

    sweetness

     noun
    noun
    NAmE//ˈswitnəs//
     
    [uncountable]
     
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  1. 1the quality of being pleasant a smile of great sweetness He was attracted to her sweetness and innocence.
  2. 2the quality of tasting or smelling sweet The air was filled with the sweetness of mimosa.
  3. Idioms
      be (all) sweetness and light
       
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    1. 1(of a person) to be pleasant, friendly, and polite I can't complain—he's been all sweetness and light with me.
    2. 2(of a situation) to be enjoyable and easy to deal with It's not all sweetness and light being an actor.
See the Oxford Advanced Learner's Dictionary entry: sweetness