insatiable - vocabulary

  edgood  —  Grammar Tips

Incapable of being satisfied or appeased, as in an insatiable thirst for fine wine.
Sonia said this as though in despair, wringing her hands in excitement and distress. Her pale cheeks flushed, there was a look of anguish in her eyes. It was clear that she was stirred to the very depths, that she was longing to speak, to champion, to express something. A sort of insatiable compassion, if one may so express it, was reflected in every feature of her face.

—Fyodor Dostoevsky Crime and Punishment (1917)