Definition of "exhaustless"

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; [...]

1818, John Keats, “Book III”, in Endymion: A Poetic Romance, London: […] [T. Miller] for Taylor and Hessey, […], page 149, lines 932–935

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 […]

1830, Anna Maria Porter, The Barony, volume 3, page 460

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

1969, Machine Design, volume 41, page 60

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.

1971, John R. Wish, Marketing and social issues: an action reader, John Wiley & Sons

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 ...

1973, Eckhard Schulze-Fielitz, Stadtsysteme

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 ...

1979, Cars and Parts, volume 22, page 13

Trying to figure out the technology behind its operation—he had seen exhaustless vehicles in another Outline, apparently run on broadcast power ...

2014, Matthew Johnson, Irregular Verbs, ChiZine