不行will not do

• 这样办不成。

  This way won't work.

• 不成, 你不能走!

  This won't do, you can't leave!

• 不成! 我不同意。

  This won't do! I don't agree.

不中用useless

表示反问used at the end of a rhetorical question

• 难道就算了不成?

  How can we just leave it at that?

• 难道我们怕你不成?

  Did you think we would be scared of you?