quenchless

transitive verb

1. to extinguish; put out: to quench fire with water
2. to overcome; subdue; suppress
3. to satisfy; slake: to quench one's thirst
4. to cool (hot steel, etc.) suddenly by plunging into water, oil, or the like

Origin: ME quenchen < OE cwencan, to extinguish, caus. of cwincan, to go out, akin to Fris kwinka, MHG verquinen, to pass away < IE base *gwey-, to complain, weep