airy

adjective

1. open to or abounding in fresh air"airy rooms"
2. not practical or realizable; speculative"airy theories about socioeconomic improvement"
3. having little or no perceptible weight; so light as to resemble air"airy gauze curtains"
4. characterized by lightness and insubstantiality; as impalpable or intangible as air"figures light and aeriform come unlooked for and melt away"