Impossible to quench.

synonym: unquenchable.

Roget 817a: greedy, avaricious, covetous, acquisitive, grasping; rapacious; lickerish^†.    greedy as a hog; overeager; voracious; ravenous, ravenous as a wolf; openmouthed, extortionate, exacting, sordid^†, alieni appetens [Lat.]; insatiable, insatiate; unquenchable, quenchless; omnivorous.    ... show more