There is no point doing such a silly thing.
做这件傻事毫无意义。
There is no point in doing so.
这样做毫无意义。
There is no point(in)doing sth.
做某事没有作用/毫无意义。
There is absolutely no point doing something if you are not having fun doing it.
如果做的事情没有乐趣，就完全没有必要做它。
There is absolutely no point doing something if you are not having fun doing it.
如果做的事情没有乐趣，就完全没有必要做它。
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