1. the quality or state of being impossible to pass through or traverse

Examples

• The impassability of the mountain range made it a natural border between the two regions.
• Heavy snow increased the impassability of the rural roads during winter.
• The river's impassability during flood season prevented travelers from crossing.
• Engineers had to address the impassability of the damaged bridge before traffic could resume.
• The dense jungle's impassability made exploration extremely difficult.