unquenchable

adj

1. That cannot be quenched.

   “After a twelve-mile run in the hot sun, his thirst felt unquenchable.”

   “Alas! thus ever does the weakness of our nature rebuke its strength, and genius is brought to the level—ay, below the level—of common humanity, by an unquenchable thirst for its applause.”

   “With an unquenchable enthusiasm for locomotives and their work, at an early age I had commenced to keep engine and traffic-recording notebooks, compiled in a schoolboy's round hand.”

   “President Trump did not need to warp intelligence to justify his decision. But he did anyway, to satisfy his unquenchable ego.”