Source : Webster's Revised Unabridged Dictionary (1913)

Inaccessible \In`ac*cess"i*ble\, a. [L. inaccessibilis: cf. F.
   inaccessible. See {In-} not, and {Accessible}.]
   Not accessible; not to be reached, obtained, or approached;
   as, an inaccessible rock, fortress, document, prince, etc. --
   {In`ac*cess"i*ble*ness}, n. -- {In`ac*cess"i*bly}, adv.

Source : WordNet®

inaccessible
     adj 1: capable of being reached only with great difficulty or not
            at all [syn: {unaccessible}] [ant: {accessible}]
     2: not capable of being obtained; "a rare work, today almost
        inaccessible"; "timber is virtually unobtainable in the
        islands"; "untouchable resources buried deep within the
        earth" [syn: {unobtainable}, {unprocurable}, {untouchable}]