Impractical means not sensible or useful in real situations. Something impractical might look good on paper or seem clever in theory, but it doesn't actually work well when you try to use it.

Imagine someone designing a backpack with seventeen tiny pockets instead of a few larger ones. It sounds organized, but finding anything would take forever. That's an impractical design. Or picture wearing fancy dress shoes on a hiking trip: they might look nice, but they'd give you blisters and wouldn't grip the trail. Impractical.

The word often describes ideas, plans, or objects that ignore real-world limitations. An impractical person might suggest building an elaborate treehouse without considering whether anyone actually knows carpentry, has the tools, or can afford the lumber. Their enthusiasm is great, but their plan doesn't account for reality.

Impractical is different from impossible. An impractical idea could work, but it would be too difficult, expensive, time-consuming, or complicated to make sense. You could theoretically handwrite a book report using a feather quill and ink, but it would be impractical when you have perfectly good pens available.

The opposite is practical: useful, sensible, and suited to real situations. Practical people think through the actual steps needed to accomplish something and whether those steps make sense.