Etymology
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unquenchable (adj.)

late 14c., of fire; 1560s, of thirst, from un- (1) "not" + quench (v.) + -able. Related: Unquenchably.

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Definitions of unquenchable

unquenchable (adj.)
impossible to quench;
unquenchable thirst
Synonyms: quenchless
From wordnet.princeton.edu