(a.) Not practical.

abstract academic airy armchair autistic awkward beyond one bulky clumsy conjectural contrary crosswise cumbersome dereistic hulking hulky hypothetic ideal idealistic impracticable in the clouds inconvenient ineffective ineffectual infeasible inoperable insuperable insurmountable moot nonfunctional nonrealistic notional otherworldly perverse poetic ponderous postulatory quixotic romancing romantic romanticized speculative starry starry-eyed storybook theoretical too much for transcendental transmundane unachievable unattainable unavailing uncompassable undoable uneffectible unfeasible unhandy unmanageable unnegotiable unperformable unpractical unrealistic unrealizable unserviceable unsurmountable unusable unwieldy unworkable useless visionary wild wish-fulfilling