always determined and energetic in trying to achieve something and never willing to admit defeat:
Thesaurus: synonyms and related words
Energetic and lively
See more results »
never becoming tired:
英语词典包含110679条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。