• airborne, feathery, flappy, flaunting, flickering, floating, flying, hovering, in suspension, loose, poised, soaring, suspended
• ballooning, beat, flicker, flutter, interference, interfering, levitation, swim, waft
• to flap, to flutter, to waft
• flourish, flutter, wave, wobbling
• specks of dust that swim in sunbeams
• beat between two impressed frequencies