Synonyms for weightless
ˈweɪt lɪsweight·less

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1. weightlessadjective

   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"

   Antonyms:
   weighty

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1. Astronaut Mike Fincke:

   The reason why we train underwater is because we actually wear real spacesuits, we do real tasks and we feel like we are weightless, when actually we're just neutrally buoyant so we're floating.

2. Evelyn Ashford:

   When I'm running fast, I feel like I'm weightless, it's like I'm flying, like I'm not even touching the ground.

3. Guy Trudel:

   Thankfully, having fewer red blood cells in space isn't a problem when your body is weightless, but when landing on Earth and potentially on other planets or moons, anemia affecting your energy, endurance and strength can threaten mission objectives. The effects of anemia are only felt once you land, and must deal with gravity again.