Definition of unconcern noun from the Oxford Advanced American Dictionary

     

    unconcern

     noun
    noun
    NAmE//ˌʌnkənˈsərn//
     
    [uncountable](formal)
     
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  1. 1a lack of care, interest, or worry about something that other people would care about synonym indifference
  2. 2 She received the news with apparent unconcern. compare concern
See the Oxford Advanced Learner's Dictionary entry: unconcern