weight ‧ less /ˈweɪtləs/ BrE AmE 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]