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impassable
01
(of a path) not possible to travel across or through
Example
The road was impassable because of the deep snowdrifts that accumulated overnight.
Quantum tunneling allows particles to pass through energy barriers that would be impassable according to classical mechanics.
The landslide covered the road with a thick layer of mud, making it impassable for vehicles.
Heavy snowfall barred the mountain pass, making it impassable for travelers until the roads could be cleared.
The floodwaters washed over the road, making it impassable.
