insatiable
adjective uk/ɪnˈseɪ.ʃə.bəl/ us/ɪnˈseɪ.ʃə.bəl/
（尤指欲望或需求）无法满足的，贪得无厌的
(especially of a desire or need) too great to be satisfied
Like so many politicians, he had an insatiable appetite/desire/hunger for power. 同许多政客一样，他对权力贪得无厌。
Nothing, it seemed, would satisfy his insatiable curiosity. 看起来什么都无法满足他那无尽的好奇心。