insurmountable

from WordNet (r) 3.0 (2006)
insurmountable
    adj 1: not capable of being surmounted or overcome;
           "insurmountable disadvantages" [syn: {insurmountable},
           {unsurmountable}] [ant: {surmountable}]
    2: impossible to surmount [syn: {insuperable}, {insurmountable}]
    
from The Collaborative International Dictionary of English v.0.48
Insurmountable \In`sur*mount"a*ble\, a. [Pref. in- not +
   surmountable: cf. F. insurmountable.]
   Incapable of being passed over, surmounted, or overcome;
   insuperable; as, insurmountable difficulty or obstacle.
   --Locke.
   [1913 Webster]

         Hope thinks nothing difficult; despair tells us that
         difficulty is insurmountable.            --I. Watts.

   Syn: Insuperable; impassable; invincible.
        [1913 Webster]
    
from Moby Thesaurus II by Grady Ward, 1.0
20 Moby Thesaurus words for "insurmountable":
      beyond one, impassable, impracticable, impractical, indomitable,
      inoperable, insuperable, invincible, too much for, unachievable,
      unattainable, uncompassable, unconquerable, undoable, uneffectible,
      unnegotiable, unperformable, unrealizable, unsurmountable,
      unworkable

    

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