impractical

Building a bridge across the entire ocean is an impractical idea due to the immense cost.

(Chinese) 由于成本巨大，横跨整个大洋建桥是一个不切实际的想法。

High-heeled shoes are beautiful to look at but very impractical for a long hike in the mountains.

(Chinese) 高跟鞋看着很美，但在山里长途跋涉时非常不实用。