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impassable
01
(of a path) not possible to travel across or through
impassable
adj
passable
adj
pass
n
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 floodwaters washed away the bridge, leaving it impassable.
Heavy snowfall closed the mountain pass, making it impassable for vehicles.
The floodwaters washed over the road, making it impassable.