Airy

Adjective:

1. Open to or abounding in fresh air
2. Not practical or realizable; speculative
3. Having little or no perceptible weight; so light as to resemble air
4. Characterized by lightness and insubstantiality; as impalpable or intangible as air

Usage:

1. "airy rooms"
2. "airy theories about socioeconomic improvement"
3. "airy gauze curtains"
4. "an airy apparition"

Noun:

1. Air
2. Airiness

Adverb:

1. Airily

Synonyms:

1. Aerial
2. Aeriform
3. Aery
4. Aired
5. Ethereal
6. Etherial
7. Impractical
8. Laputan
9. Visionary
10. Windy