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
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untiring