slakeless🔊adjEtymology From slake + -less.1Archaic, Poetic Not capable of being slaked.my slakelesse payne hells horror doth exceedec. 1600, Richard Linche, Diella, Sonnet XXX:Who sleeps to dream of blood, and waking glows With the oft-baffled, slakeless thirst of change1821, Lord Byron, The Prophecy of Dante, Canto 1: