Synonyms for Weightless:

adj.

light (adjective)
unsubstantial, light, light as a feather, airy, feathery, ethereal, buoyant, gossamer, lightweight, delicate.
unsubstantial (adjective)
impalpable, unconcrete, inessential, immaterial, null, apparitional, phantasmal, ethereal, vacant, intangible, nonexistence, insignificance, unreal, chimerical, tenuous, vacuous, illusory, spectral, empty, unsubstantial.

Other synonyms:

lightweight. Other relevant words:
lightweight, light as a feather.

Usage examples for weightless

  1. Still hardly more than half- conscious, lying, it seemed, on a soft bed where he was weightless he stirred and flung out one arm. – The Finding of Haldgren by Charles Willard Diffin