Etymology
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weightless (adj.)

"having no weight," 1540s, from weight (n.) + -less. Related: Weightlessly; weightlessness (1867).

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Definitions of weightless

weightless (adj.)
having little or no weight or apparent gravitational pull; light;
jackets made of a weightless polyester fabric
a baby bat...fluffy and weightless as a moth
floating freely in a weightless condition
From wordnet.princeton.edu