Collocations for impractical - adj.

be, prove, seem
Such a solution proved impractical.

become
make sth, render sth
The weight of the machine makes lifting it impractical.

consider sth, deem sth, find sth, regard sth as
They found his ideas impractical.

extremely, fairly, very, etc.
highly, hopelessly, wildly
The long flowing dress was highly impractical.

completely, entirely, quite (esp. BrE), totally, utterly, wholly (esp. BrE)
often
This approach is often impractical given the size of the area.

economically, financially (both esp. AmE)
hopelessly
He was hopelessly impractical when it came to planning new projects.