A passable law might be:
The word passable is an adjective. It describes something that can be passed.
unpassable
irascible
Is it passable fair fine good excellent splendid
It is not passable there is no evolving for it
not passable, blocked
Some looking like a woman
respectable, tolerable, acceptable
Well, honey, a possible prefix for "passable" is "im." So, if you slap that bad boy in front of "passable," you get "impassable," meaning something that can't be passed through. So, there you have it, darling.
After I received a failing mark on my English paper, I spoke to the teacher and explained that, while I didn't think I deserved an "A", the work I did was certainly passable.
He plays a barely passable saxophone.
A mediocre grade is one that is barely passable.