What is another word for "ethereal"?

Roget's Thesaurus (1911) lists these synonyms for "ethereal": aeration, aerial, aerification, aeriform, aerodynamics, aerostatics, air, airy, alkali, ammonia, ammoniacal, astatic, balloon, barm, bladder, bubble, buoy, buoyancy, buoyant, cloud, cobweb, convection, cork, diffuse, down, draft, dust, effluvium, elastic, emit, essence, ether, evanesce, evaporable, evaporate, feather, ferment, fish, flatulence, flatulency.