Source : Webster's Revised Unabridged Dictionary (1913)

Unsatiable \Un*sa"ti*a*ble\, a.
   Insatiable. [Obs.] --Hooker. -- {Un*sa"ti*a*ble*ness}, n.
   [Obs.] -- {Un*sa"ti*a*bly}, adv. [Obs.]

Source : WordNet®

unsatiable
     adj : impossible to satiate or satisfy; "an insatiable appetite";
           "an insatiable hunger for knowledge" [syn: {insatiate},
            {insatiable}] [ant: {satiate}]