insatiable
adj
~ (for sth) that cannot be satisfied; very greedy 不能满足的; 极贪心的
Another cake? You´re insatiable! 再来一块蛋糕? 你可真贪得无厌!
an insatiable appetite, curiosity, desire, thirst (for knowledge), etc 永不满足的食欲、 好奇心、 欲望、 (求知)如渴之欲等
a politician who is insatiablefor power 权欲心重的政客.