characterized by lightness and insubstantiality; as impalpable or intangible as air; "figures light and aeriform come unlooked for and melt away"- Thomas Carlyle; "aerial fancies"; "an airy apparition"; "physical rather than ethereal forms"
軽さと空虚によって特徴づけられる
ethereal
of or containing or dissolved in ether; "ethereal solution"