Definition of impassable adjective from the Oxford Advanced American Dictionary

 

impassable

 adjective
adjective
NAmE//ɪmˈpæsəbl//
 
 
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(of a road, an area, etc.) impossible to travel on or through, especially because it is in bad condition or it has been blocked by something The mountain roads are totally impassable to cars in winter. After the storm, many roads were made impassable by fallen trees. The river formed an impassable barrier for migrating animals. opposite passable
See the Oxford Advanced Learner's Dictionary entry: impassable