exhaustless

adj

1. Unable to be exhausted; having an endless supply; inexhaustible.

   “Nectar ran / In courteous fountains to all cups outreach'd; / And plunder'd vines, teeming exhaustless, pleach'd / New growth about each shell and pendent lyre; [...]”

   “The exhaustless conjecturings of that evening's full conversation, made such of the small party, as had hitherto been strangers, well acquainted with each other's turn of mind; […]”

2. Not producing exhaust.

   “Near-synonym: nonpolluting”

   “These obstacles preclude near-future solutions for exhaustless vehicles, or those having an exhaust with greatly reduced toxicity.”

   “We need an exhaustless automobile, a noiseless and versatile airplane. We need new methods of reducing and coping with wastes—radioactive, sewage, gaseous, and liquid.”

   “The car is at the same time the greatest producer of noise and the greatest polluter, and thus responsible for the rapidly accelerating debasement of the human environment. The long overdue noiseless and exhaustless automobile would ...”

   “After he had finished he drove it over to Newton and started parading back and forth in the exhaustless car in front of the Stanley plant. Not a single whisp of steam could be seen, exhausting out any exhaust pipe. In fact he had no exhaust pipe ...”