impassable
adjective uk/ɪmˈpɑː.sə.bəl/ us/ɪmˈpæs.ə.bəl/
（道路）不能通行的，无法通过的
An impassable road or path cannot be travelled on because of bad weather conditions or because it is blocked.
Many roads were flooded and impassable following the storm. 暴风雨过后，许多道路被淹，无法通行。
Synonym: blocked
Opposite: passable