"weightless" in the adjective sense
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"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License