insatiable

adj

1. Not satiable; incapable of being satisfied or appeased; very greedy.

   “Hugo, in a fine frenzy, threatens to depose the Sacristan, to do this and do that; but, in the mean while, how to quiet your insatiable Jew? Hugo, for this couple of hundreds, grants the Jew his bond for four hundred payable at the end of four years. (...) Neither yet is this insatiable Jew satisfied or settled with: he had papers against us of 'small debts fourteen years old;' his modest claim amounts finally to 'Twelve hundred pounds besides interest'”

   “Guestling, who adds an insatiable jealousy to his other domestic virtues, vetoed the new acquaintance and thenceforward the two met hurriedly and furtively in town.”

   “Such an appointment would realize my fondest dreams. But no, at any sacrifice, I must set bounds to my insatiable ambition!”

   “The girls are constantly reshuffled into new permutations in order to feed the J-pop market's insatiable demand for fresh looks and faces.”

noun

1. One who or that which cannot be satiated.