be incapable of doing anything;can do nothing ❍ 不错，从现在的所谓文学家的最要卖弄文字，夺掉笔杆便～的事实看起来，的确首先就要想到他； …… (鲁迅《且介亭杂文·门外文谈》67)Undoubtedly this would be the first thought to occur to us when we remember that the sole aim of ourmodern “men of letters” is to show off their literaryability and that they can do nothing except flourish apen.
一无所能yī wú suǒ nénɡ
一点本领都没有。can do nothing, be incapable of doing anything