Adjective
anti-gravitational (not comparable)
Alternative form of antigravitational
While the circumnavigation of the solar system seems farfetched, it may not be once the problem of effective anti-gravitational control is solved. Donald A. Wollheim
I think that the first men to land on Pluto are going to make some very astonishing discoveries. But I am also sure that they will never go there in rockets. They will have to make the immense trip by some more powerful means - like the anti-gravitational drive. Donald A. Wollheim