I feel the plan was unpractical.

我觉得这计划不可行。

His desire to be No . 1 is unpractical .

他想要成为第一的渴望是不切实际的。

I agree with you in thinking that the plan is unpractical.

我同意你的看法：这个计划不实际。

You're surely not suggesting that the project is unpractical.

你当然不是在暗示这方案不可行吧。

On pursuing the unpractical things, you will gain nothing in vain.

一味地追求不切实际的东西，到头来只能是竹篮打水一场空。