[adj] 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"
[adj] having little or no perceptible weight; so light as to resemble air; "airy gauze curtains"
[adj] not practical or realizable; speculative; "airy theories about socioeconomic improvement"; "visionary schemes for getting rich"
[adj] open to or abounding in fresh air; "airy rooms"
aerial, aeriform, aery, aired, ethereal, impractical, insubstantial, light, unreal, unsubstantial, utopian, ventilated, visionary