nonpropellant

Example:The spacecraft's landing system used nonexpellant methods to ensure a soft touchdown on the Martian surface.

Definition:Not involving the use of an explosive or propellant, often used in a technical context.

Example:Although thermonuclear reactions do not use a propellant, they are a different form of propulsion for nuclear-powered rockets.

Definition:Relating to the use of nuclear fusion, which does not typically involve chemical propellants, but is not a direct synonym in this specific context.