1. (superl.) Full of foam or froth, or consisting of froth or light bubbles; spumous; foamy.

2. (superl.) Not firm or solid; soft; unstable.

3. (superl.) of the nature of froth; light; empty; unsubstantial.

airy asinine barmy birdbrained birdwitted brave bravura braw bubbly catchpenny chichi daring dashing downy dressy empty ethereal exhibitionistic fatuous featherbrained feathery flashing flashy flaunting flighty flimsy fluffy foam-flecked foamy foolish fribble fribbling frilly frivolous futile gallant gay glittering gossamery heady idle imponderous inane jaunty jazzy lathery leger light light as air lighter than vanity mousse nugacious nugatory otiose rakish shallow shallow-headed shallow-minded shallow-pated shallow-witted showy silly slender slight snazzy soapsuddy soapsudsy soapy souffle splashy splurgy sporty spumose spumous spumy suddy sudsy superficial trifling trite trivial unheavy unprofound vacuous vain vapid volatile weightless windy yeasty