im-,不，非，practical,切合实际的。

1. It became impractical to make a business trip by ocean liner.

乘坐远洋班轮进行商务旅行变得不合时宜了。

2. Geniuses are supposed to be eccentric and hopelessly impractical.

天才通常都被认为行为古怪而且毫无实践能力。

3. When stalking subjects, a tripod is impractical.

潜步跟踪目标时，用三脚架是不切实际的。

4. It was totally impractical to think that we could finish the job in two months.

认为我们能在两个月之内完成这项工作，这完全是不切实际的。

5. The ideas of a visionary may seem impractical to us.

在我们看来,空想家的观念好像不切实际.