WEIGHTLESS
weightless
(adjective) 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® 3.1
Etymology
Adjective
weightless (comparative more weightless, superlative most weightless)
Which has no weight.
Which is not being affected by gravity.
Source: Wiktionary
Weight"less, a.
Definition: Having no weight; imponderable; hence, light. Shak.
Source: Webster’s Unabridged Dictionary 1913 Edition