insatiable
impossible to satisfy; always wanting more
Roots
- -able / -ible: able to be, fit to be, or worthy of
- im- / in- (not): not or without
- sat / satis: enough, full, satisfied, or filled
Other words with the sat / satis root
Insatiable adds not and able to satisfy: the appetite keeps asking after enough should have arrived.
His insatiable curiosity made one answer turn into five better questions.
Satisfy gives the enough image. Insatiable removes the endpoint: food, ambition, curiosity, or demand keeps wanting more.