Revenge of the nerred

"To nerr" should be a verb.
Then we could say we've
gone nerring, or nerrant.
I'm going to nerr you, or
Has she been nerring,
lately?

It would basically mean:

"To do no wrong," such as
not to err, or not to wrong
someone (typically another).

Watch out, though.

Some people might not
like to be nerred. They might
not care for the term, perchance.
They might think YOU think

you're infallible.
You could just say

NOPE! 
Just nerring
the best I can