"impractical" in the adjective sense
1. impractical
not practical not workable or not given to practical matters
"refloating the ship proved impractical because of the expense"
"he is intelligent but too impractical for commercial work"
"an impractical solution"
2. airy, impractical, visionary, Laputan, windy
not practical or realizable speculative
"airy theories about socioeconomic improvement"
"visionary schemes for getting rich"
Source: WordNet® (An amazing lexical database of English)
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