不中

I may be senescent, but I'm not yet senile.

我有点显老, 但还没有老得不中用。

He might look past it, but I bet he can run faster than you.

他可能看起来老得不中用，不过我敢打赌他跑得比你快。

The gharry ponies are gaunt, vicious things that have been sold cheap as having a few years’ work left in them.

矮种马又瘦又不中用，钱便宜，因为只能干几。

Mr. Kawakami said that while some of Japan's anticrime devices might not seem practical, they were valuable because they might lead to even better ideas.

川上健二说，日本一些防犯罪装置也许中看不中用，但仍有启发更好发明值。