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

     

    sweetness

     noun
    noun
    BrE BrE//ˈswiːtnəs//
     
    ; NAmE NAmE//ˈswiːtnəs//
     
    [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. Extra examples People think she’s all sweetness and light, but she actually has a temper. She smiled with saccharine sweetness. This is a full-bodied wine with just a hint of sweetness. Vanilla adds sweetness and creaminess to ice cream. the lingering sweetness of incense to taste the sweetness of military successIdioms
      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 American Dictionary entry: sweetness