1. 
[syn: unapproachable, unreachable, unreached, out of reach(p)]
WordNet (r) 3.0 (2006):
unreachable
    adj 1: inaccessibly located or situated; "an unapproachable
           chalet high in the mountains"; "an unreachable canyon";
           "the unreachable stars" [syn: unapproachable,
           unreachable, unreached, out of reach(p)]
Moby Thesaurus II by Grady Ward, 1.0:
19 Moby Thesaurus words for "unreachable":
   beyond reach, closed forever to, closed to, impenetrable,
   impervious, inaccessible, lost to, out of reach, un-come-at-able,
   unaccessible, unapproachable, unattainable, unavailable,
   undiscoverable, ungetatable, ungettable, unobtainable,
   unprocurable, unsecurable