impractical

adj. /ɪmˈpræktɪkl/ B2

不切实际的；不现实的

Not sensible or realistic; not easy to put into practice.

仙境例句

A neck as long as a tree is very impractical when you want a drink of water.

想喝口水的时候，脖子长得像树一样高可真不实用。