Impractical people are not naturally good at doing useful jobs such as making or repairing things.

Impractical arrangements, ideas, or methods cannot be done or used easily or effectively.

It's impractical to have so many people all trying to use this equipment at the same time. 要让这么多人同时使用这个设备是不切实际的。

Impractical clothes, devices, etc. cause problems when used in normal situations.

I love high heels but they're rather impractical. 我喜欢高跟鞋，但它很不实用。