Something that is weightless weighs nothing or seems to weigh nothing.
Photons have no mass–they are weightless.
...weightless silk curtains.
2. adjective
A person or object is weightless when they are in space and the earth's gravity does not affect them, so that they float around.
Helen described life in a weightless environment during her period in space.
weightlessnessuncountable noun
...the human body's response to weightlessness.
weightless in British English
(ˈweɪtləs)
adjective
1.
(of a body) having no actual weight; a state in which an object has no actual weight (because it is in space and unaffected by gravitational attraction) or no apparent weight (because the gravitational attraction equals the centripetal force and the object is in free fall)
2. business
a.
(of economic activity) based on the supply of information and ideas rather than trade in physical goods
the weightless economy
b.
(of a company) having very few physical assets
weightless dot.coms
Derived forms
weightlessness (ˈweightlessness)
noun
weightless in American English
(ˈweɪtlɪs)
adjective
having little or no apparent weight
; specif.,
a.
falling freely through a gravitational field, without apparent gravitational effects, as everything does inside an orbital spacecraft
b.
of or having zero gravity
c.
existing in a state of equilibrium within a fluid
Derived forms
weightlessly (ˈweightlessly)
adverb
weightlessness (ˈweightlessness)
noun
Examples of 'weightless' in a sentence
weightless
Straightforward but weightless, he reasoned that if your X-ray wasn't right you had only one thing.
Sillitoe, Alan THE OPEN DOOR (2002)
He came flying back past me, almost weightless in the air: giving vent to a geyser of brilliant red.
Pritchard, John NIGHT SISTERS (2002)
Their weightless bodies, curled into mine like little blind puppies.
Gee, Maggie LOST CHILDREN (2002)
"I was wearing the red dress Brismand had given me; the silk was almost weightless against my skin.