airy in WordNet English dictionary

1. 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"
   aeriform  aerial  airy  aery  ethereal 
   
2. open to or abounding in fresh air
   "airy rooms"
   aired  airy 
   
3. having little or no perceptible weight; so light as to resemble air
   "airy gauze curtains"
   airy 
   
4. not practical or realizable; speculative
   "airy theories about socioeconomic improvement"; "visionary schemes for getting rich"
   airy  impractical  visionary  Laputan  windy