Used to describe physical obstacles that prevent movement, like a road blocked by a landslide. After the earthquake, the main road was impassable.
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Figurative Speech
Can also describe a situation that's extremely difficult or impossible to overcome. The political gridlock made negotiation between the parties impassable.
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Often Temporary
The situation described as 'impassable' is usually temporary, like a flooded road, not permanent. The hiking trail is impassable in the rainy season but opens up by summer.