“+ adjective
Etymology: Middle English, from un- (I) + quenchen to quench + -able
1. : not quenchable : inextinguishable
an unquenchable underground fire
2. : not capable of being satisfied, quelled, or discouraged : insatiable
the author's unquenchable enthusiasm for his theories — Ralph Linton
• un·quench·ably -əblē, -li adverb