Definition of unquenchable adjective from the Oxford Advanced Learner's Dictionary

 

unquenchable

 adjective
adjective
BrE BrE//ʌnˈkwentʃəbl//
 
; NAmE NAmE//ʌnˈkwentʃəbl//
 
(formal)
 
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that cannot be satisfied an unquenchable desire He had an unquenchable thirst for life. see also quench
See the Oxford Advanced American Dictionary entry: unquenchable