incommeabilis
Could not find incommetior in Logeion dictionaries. Looking for closest alphabetic form.
in-commĕābĭlis, e, adj.,
- not traversable, impassable: via, Amm.16, 11, 8 (al. difficiles).
licet cum multa difficultate per montium ~es semitas ‥ ad Sanctum Ambrosium devenerimus