The adjective impractical means that something is not practical, or not likely to work.
The idea of building a wall to keep out the immigrants is completely impractical.
It's impractical to try and fix everything that's wrong with the system.
adjective
not practical or realizable; speculative
Synonyms:
adjective
not practical; not workable or not given to practical matters
1
That seems impractical on the web.
2
Most of the experiments are unsatisfactory and impractical.
3
The style is harmonious, dignified, and not impractical.
4
The table is much more impractical.
5
In many cases the use of a screensaver is impractical.
6
Huggins believed the policy was unpopular and impractical.
7
The system was determined to be impractical and never implemented.
8
After the war the method was largely abandoned as impractical.
9
The environment is preserved in areas impractical and sparsely populated.
10
As it became clear that retreat was impractical, the orders were countermanded.