inaccessible, unaccessible

capable of being reached only with great difficulty or not at all

• backwoods(a), outback(a), remote — inaccessible and sparsely populated
• deserted — remote from civilization
• pathless, roadless, trackless, untracked, untrod, untrodden — lacking pathways
• lonely(a), solitary, unfrequented — separated from or unfrequented by others; remote or secluded
• unapproachable, unreachable, unreached, out of reach(p) — inaccessibly located or situated
• un-come-at-able, un-get-at-able, ungetatable — (informal) difficult to reach or attain

• handiness, accessibility, availability, availableness — the quality of being at hand when needed