Answer by
tamarawilhite (17883)
"Never satisfied", "bottomless", "without end", "forever hungry", unslakable, inappeasable, impossible, bottomless pit, unquenchable, insatiate, starved, empty, leviathan, snake swallowing its own tail, covetous, Midas, avaricious, green god of envy, desirous, malcontentment, and endlessly longing are options.