not practical or useful.

not capable of dealing with practical matters; lacking sense.

idealistic.

impracticable.

adjective

practical , sensible

adjective

abstract , absurd , chimerical , idealistic , illogical , impossible , impracticable , improbable , inapplicable , inefficacious , infeasible , inoperable , ivory-tower , no go , nonfunctional , nonviable , otherworldly , quixotic , romantic , speculative , starry-eyed , theoretical , unattainable , unbusinesslike , unfeasible , unreal , unserviceable , unusable , unwise , unworkable , useless , visionary , wild , [[won\'t flynotes:impractical means \'not advisable to put into practice\' while impracticable means \'not capable of being put into practice\'; impractical or unpractical is something that can be done but isn\'t worth doing while impracticable means it can\'t be done at all]] , unrealizable , unthinkable , unnegotiable , academic , daydreaming , doctrinaire , dogmatic , escapist , feckless , implausible , irresponsible , pedantic , unrealistic , utopian