airy

open to or abounding in fresh air

• “airy rooms”

not practical or realizable; speculative

• “airy theories about socioeconomic improvement”
• “visionary schemes for getting rich”

having little or no perceptible weight; so light as to resemble air

• “airy gauze curtains”

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”