Definition of untiring adjective from the Oxford Advanced Learner's Dictionary

 

untiring

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