Source : Webster's Revised Unabridged Dictionary (1913)

Infeasible \In*fea"si*ble\, a.
   Not capable of being done or accomplished; impracticable.
   --Glanvill.

Source : WordNet®

infeasible
     adj : not capable of being carried out or put into practice;
           "refloating the sunken ship proved impracticable
           because of its fragility"; "a suggested reform that was
           unfeasible in the prevailing circumstances" [syn: {impracticable},
            {unfeasible}, {unworkable}]