inaccessible
in-ac-ces-si-ble
adjective
Difficult or impossible to reach, enter, or obtain.
"The remote mountain peak was completely inaccessible."
Thesaurus
Synonyms: pathless, out of reach, un-come-at-able, untrod, remote, trackless, unaccessible, untracked, roadless, ungetatable, untrodden, outback
Antonyms: accessible