Passability is a antonym of impassability.
As nouns the difference between impassability and passability
is that impassability is the state or quality of being impassable while passability is the state or quality of being passable.
impassability
English
Noun
(-)
The state or quality of being impassable.
Antonyms
* passability
passability
English
Noun
(-)
The state or quality of being passable.
Antonyms
* impassability