impassable

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im·pass·a·ble / imˈpasəbəl/ • adj. impossible to travel along or over: the narrow channels are impassable to oceangoing ships.DERIVATIVES: im·pass·a·bil·i·ty / -ˌpasəˈbilitē/ n.im·pass·a·ble·ness n.im·pass·a·bly / -blē/ adv.