unrepassable
adjective
un·re·pass·able
¦ən(ˌ)rē¦pasəbəl,
-paas-,
-pais-,
-pȧs-
archaic
: incapable of being passed again : not to be traversed in returning
Word History
Etymology
un- entry 1 + repass + -able
First Known Use
1600, in the meaning defined above