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"
practical having or put to a practical purpose or use; "practical mathematics"; "practical applications of calculus"
impossible not capable of occurring or being accomplished or dealt with; "an impossible dream"; "an impossible situation"
unrealistic not realistic; "unrealistic expectations"; "prices at unrealistic high levels"
practicality concerned with actual use rather than theoretical possibilities
quixotic,
wild-eyed,
romantic not sensible about practical matters; idealistic and unrealistic; "as quixotic as a restoration of medieval knighthood"; "a romantic disregard for money"; "a wild-eyed dream of a world state"
unfunctional not related to or suitable for everyday needs or activities
impractical -
not practical or realizable; speculative; "airy theories about socioeconomic improvement"; "visionary schemes for getting rich"
utopian characterized by or aspiring to impracticable perfection; "the dim utopian future"; "utopian idealists"; "recognized the utopian nature of his hopes"
