Weightless

a.

1.

Having no weight; imponderable; hence, light.

Adj.

1.

weightless - having little or no weight or apparent gravitational pull; light; "floating freely in a weightless condition"; "a baby bat...fluffy and weightless as a moth"; "jackets made of a weightless polyester fabric" Antonyms: weighty - having relatively great weight; heavy; "a weighty load"; "a weighty package"

airy, bodiless, bubbly, downy, ethereal, featherweight, feathery, fluffy, foamy, frothy, gossamery, immaterial, impalpable, imponderable, imponderous, incorporeal, insubstantial, intangible, leger, light, light as air, lighter than vanity, lightweight, mousse, nonsubstantial, souffle, unconcrete, unheavy, unsolid, unsubstanced, unsubstantial, volatile, yeasty