as weak as water meaning in Chinese

极虚弱
弱不禁风，身体虚弱，意志薄弱
身体虚弱

I ' m as weak as water
我身子虚得很呢
This report is ambiguity to begin with and the next arguments are as weak as water
这份报告第一论点不明确，第二论据也不充分。
He would have worked for his exams all may if his friends had left him alone . unfortunately they didn ' t , and he ' s as weak as water when it comes to saying " no " to a friend
如果他的朋友们不来打扰，他整个5月都会准备迎考的，但令人遗憾的是他们常来，而他又性格软弱，不好意思对朋友说“不”字。