unfeasible

from WordNet (r) 3.0 (2006)

unfeasible
    adj 1: 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}, {infeasible}, {unfeasible},
           {unworkable}]

from The Collaborative International Dictionary of English v.0.48

Unfeasible \Unfeasible\
   See {feasible}.

from Moby Thesaurus II by Grady Ward, 1.0

18 Moby Thesaurus words for "unfeasible":
      beyond one, impracticable, impractical, infeasible, inoperable,
      insuperable, insurmountable, too much for, unachievable,
      unattainable, uncompassable, undoable, uneffectible, unnegotiable,
      unperformable, unrealizable, unsurmountable, unworkable

[email protected]