
1) Closed to traffic 2) Dense 3) Impossible to pass 4) Incapable of being passed 5) Insurmountable 6) Like a mountain road 7) Not passable 8) Opaque 9) Thick 10) Tightly packed 11) Unclimbable 12) Unnavigable 13) Unpassable 14) Unsurmountable 15) Untraversable
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https://www.crosswordclues.com/clue/impassable

1) Impermeable 2) Noroad 3) Unnavigable 4) Unpassable 5) Untraversable
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https://www.crosswordclues.com/clue/impassable

• (a.) Incapable of being passed; not admitting a passage; as, an impassable road, mountain, or gulf.
Found on
http://thinkexist.com/dictionary/meaning/impassable/
Im·pass'a·ble adjective [ Confer
Unpassable .] Incapable of being passed; not admitting a passage; as, an
impassable road, mountain, or gulf.
Milton. --
Im*pass'a*ble*ness ,
noun - -
Im*pass'a*bly ,
adverb Found on
http://www.encyclo.co.uk/webster/I/16

[
adj] - impossible to pass
Found on
http://www.webdictionary.co.uk/definition.php?query=impassable
unpassable adjective incapable of being passed
Found on
https://www.encyclo.co.uk/local/20974

not passable; not allowing passage over, through, along, etc.: Heavy snow made the roads impassable. · unable to be surmounted: an impassable obstacle to further negotiations. · (of currency) unable to be circulated: He tore the bill in half, making it impassable.
Found on
https://www.infoplease.com/dictionary/impassable
No exact match found.