Webster's English Dictionary

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insatiable

in.sa.tia.ble \(')in-'sa--sh*-b*l\ \-ble-\ aj [ME insaciable, fr. MF, fr. L 
   insatiabilis, fr. in- + sati]are to satisfy - more at SATIATE : incapable 
   of being satisfied : QUENCHLESS  - in.sa.tia.ble.ness n