not capable of being quenched; unquenchable.

1550–60; quench + -less

quenchlessly, adverb
quenchlessness, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
quench (kwɛntʃ)
1.  to satisfy (one's thirst, desires, etc); slake
2.  to put out (a fire, flame, etc); extinguish
3.  to put down or quell; suppress: to quench a rebellion
4.  to cool (hot metal) by plunging it into cold water
5.  physics to reduce the degree of (luminescence or phosphorescence) in (excited molecules or a material) by adding a suitable substance
6.  electronics
 a.  to suppress (sparking) when the current is cut off in an inductive circuit
 b.  to suppress (an oscillation or discharge) in a component or device
[Old English ācwencan to extinguish; related to Old Frisian quinka to vanish]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
From end to end it gives proof of an abounding life, a quenchless energy.
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