INSATIATE
insatiate, insatiable, unsatiable
(adjective) impossible to satisfy; “an insatiate appetite”; “an insatiable demand for old buildings to restore”; “his passion for work was unsatiable”
Source: WordNet® 3.1
Etymology
Adjective
insatiate (comparative more insatiate, superlative most insatiate)
(archaic or literary) That is not satiated; insatiable.
Antonyms: satiable, satisfiable
Source: Wiktionary
In*sa"ti*ate, a. Etym: [L. insatiatus.]
Definition: Insatiable; as, insatiate thirst.
The insatiate greediness of his desires. Shak.
And still insatiate, thirsting still for blood. Hook.
Source: Webster’s Unabridged Dictionary 1913 Edition