weightless

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weightless
weight‧less /ˈweɪtləs/

adjective

Word Family: adjective: overweight ≠ underweight, weighted, weighty, weightless; verb: weigh, outweigh, weight; noun: weight, weights, weighting

something that is weightless seems to have no weight, especially when it is floating in space or water
—weightlessness noun [uncountable]