impassable
Concise Oxford English Dictionary © 2008 Oxford University Press:
impassable/ɪmˈpɑːsəbl/
▶adjective impossible to travel along or over.
– derivatives
impassability noun,
impassableness noun,
impassably adverb.
impassability noun,
impassableness noun,
impassably adverb.
'impassable' also found in these Oxford entries:

