weakling
noun [ C ] disapproving uk/ˈwiː.klɪŋ/ us/ˈwiː.klɪŋ/
羸弱的人；懦弱的人
someone who is weak, either physically or in character
It would need more than a few exercises to turn a seven-stone weakling into a heavyweight boxer. 想要把一个体重只有7英石的羸弱之人变成重量级的拳击运动员，可不是单单做一些练习就办得到的。
Synonym: wuss