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- Unable to be exhausted; having an endless supply.
- 1830, Anna Maria Porter, The Barony, volume 3, page 460:
- 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 […]
- Of an automobile or similar machine, not producing exhaust; nonpolluting.