Wiktionary
reactionless
a. Devoid of reactions; not reacting.
Usage examples of "reactionless".
The reactionless drive represented a healthy initial investment, but its operating expenses were small, as it required no reaction mass.
Mars, powered forward by the cool deep blue glow of her reactionless drive.
The same one they use to reject applications for perpetual motion machines and reactionless drives - fails the standard for usefulness on the grounds of operativeness.
In every arm of the galaxy were Outsiders, using everything from photon sails to reactionless, inertialess drives to push their ships.
In every, arm of the galaxy were Outsiders, using everything from photon sails to reactionless, inertialess drives to push their ships.