a.
1.
Unsubstantial, aerial, ethereal, aeriform, thin, rare.
2.
Light, subtile, sublimated.
3.
Sprightly, buoyant, vivacious, volatile, jocund, jolly, jovial, lively, gay, wanton, merry, blithe, light, light-hearted, light of heart, in spirits, in good spirits, of good cheer.
4.
Light, buoyant, graceful, flexible, pliant, lithe.
5.
Showy, gaudy, flaunting, jaunty, garish, fine.
6.
Windy, empty.