Not satisfiable. Unable to be satisfied. (adjective)
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Use "unsatisfiable" in a sentence
"His sex drive felt radioactive, very unnatural and unsatisfiable."
"After the death of Brian Johnston he seemed to abandon levity and good humour, on air at least, alternating between choleric disdain for the players he thought not good enough and an unsatisfiable appetite for contrasting the modern game in a stridently unfavourable light with the one in which he had made his name."
"There is something about the sexual drive, Freud suggested, that makes it intrinsically unsatisfiable."