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Definition of untiring adjective from the Oxford Advanced American Dictionary

     

    untiring

     adjective
    adjective
    NAmE//ʌnˈtaɪərɪŋ//
     
    (approving)
     
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  1. 1continuing to do something for a long period of time with a lot of effort and/or enthusiasm synonym tireless
  2. 2 an untiring campaigner for human rights
See the Oxford Advanced Learner's Dictionary entry: untiring