Source : Webster's Revised Unabridged Dictionary (1913)

Inaccessibility \In`ac*cess`i*bil"i*ty\, n. [Cf. F.
   inaccessibilit['e].]
   The quality or state of being inaccessible; inaccessibleness.
   ``The inaccessibility of the precipice.'' --Bp. Butler.

Source : WordNet®

inaccessibility
     n : the quality of not being unavailable when needed [syn: {unavailability}]
         [ant: {handiness}, {handiness}]