remaining strong; not becoming weak or tired synonym tireless蓬勃的;不松懈的;不减弱的;不倦的 unflagging energy 无穷的精力 She had shown unflagging support for the cause. 她对这项事业表现出了坚定不移的支持。
Oxford Collocations DictionaryUnflagging is used with these nouns:- energy
- support