in·sa·tia·ble (ĭn-sā'shə-bəl, -shē-ə-) adj. Impossible to satiate or satisfy: an insatiable appetite; an insatiable hunger for knowledge.
[Middle English insaciable, from Old French, from Latin īnsatiābilis : in-, not; see in-1 + satiāre, to fill; see satiate.] in·sa'tia·bil'i·ty, in·sa'tia·ble·ness n., in·sa'tia·bly adv.