most impractical

abstract absurd chimerical idealistic illogical impossible impracticable improbable inapplicable inefficacious infeasible inoperable irrealizable ivory-tower no-go nonfunctional nonviable not a prayer otherworldly out of the question quixotic romantic speculative starry-eyed theoretical unattainable unbusinesslike unfeasible unreal unserviceable unusable unwise unworkable useless visionary wild won't fly

practicable practical probable realistic reasonable tenable viable

absurd illogical impossible improbable quixotic speculative unattainable unreal unusable unwise unworkable useless

abstract chimerical idealistic impracticable inapplicable inefficacious infeasible inoperable ivory-tower no go nonfunctional nonviable otherworldly romantic starry-eyed theoretical unbusinesslike unfeasible unserviceable visionary wild won't fly

believable logical possible rational reasonable sensible tenable wise

practical