The Collaborative International Dictionary of English v.0.48:

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.]
   [1913 Webster]