untiring
adjective /ʌnˈtaɪərɪŋ/
/ʌnˈtaɪərɪŋ/
(approving)- 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
Oxford Collocations DictionaryUntiring is used with these nouns:- perseverance