impractical
[im'præktikəl]
adj. 不切实际的，不现实的；不能实行的
同义词
反义词
参考例子
1.The mathematician is an impractical person who can't even boil an egg.
那位数学家是个什么事都不会做的人，连煮蛋都不会。
2.You can make some alterations in the plan in case you find anything impractical.
如果你发现这计划有什么地方不够实际，可以做一些改动。
3.Well, there is also a possibility of using function names for recursion, but you will soon see that this is often impractical nowadays.
当然还有可能在递归调用中使用函数名称，但是你将很快看到在当下他通常不大实用。
英文解释
adj.
1.not practical; not workable or not given to practical matters
2.not practical or realizable; speculative
网络释义
impractical
不切实际的; 不现实的; 不实际的; 释义：不实用的,不实际的;
though a bit impractical
虽然一个人的想象难免不切实际;
highly imaginative or impractical
耽于幻想的, 空想的, 不切实际的;
impractical and foolish
迂拙的;
arbitrary and impractical decisions
瞎指挥;