unapproachable
3 occurrences across the corpus
KJV Apocrypha (Eastern Orthodox Additions)
3 Maccabees 2:15
Your dwelling place, the heaven of heavens, is indeed unapproachable to men.
3 Maccabees 3:29
Whatever place shelters a Jew shall be made unapproachable and shall be put under the ban of fire, and be forever rendered useless to every living being for all time to come.”
OT Pseudepigrapha
The Sibylline Oracles 13:229
Sound, unhurt, unapproachable, shall rule