insatiate

Her thirst for knowledge was insatiate, and with untiring assiduity she pursued her studies.

The tiger, on the contrary, though glutted with carnage, has still an insatiate thirst for blood; his rancour has no intervals.

But the great thing was their insatiate appetites, for it is a homely truth that there is no sauce like hunger.

Ghirlandajo was an insatiate worker, and expressed a wish that he had the entire circuit of the walls of Florence to paint upon.