From Longman Dictionary of Contemporary Englishimpassableim‧pass‧a‧ble /ɪmˈpɑːsəbəl $ ɪmˈpæ-/ adjectiveTRAVELa road, path, or area that is impassable is impossible to travel along or throughThe mountains are impassable.Examples from the Corpusimpassable• Quite apart from the majorwetlands, every valleybottom below a certaincontour line must have been soggy and at times impassable.• The moralgulf between the households was soon judged by Nana to be impassable.• Were the roads really as impassable as he claimed?• The alternativeroute down the locks became virtually impassable as the locks were allowed to deteriorate.• There were so many drugs in the streets they were impassable at times.• The introduction to this book said that the Himalayas have formed an impassablebarrier in the distribution of Easternwildlife.• Roads became impassable for lack of maintenance.• The flooding made many streets impassable Sunday.• Beyond there the gorge walls are often vertical or steepslopes of rubble, impassable whatever the season.