Mr. Ning, I believe the focus of the definition is actually on wrongdoing or misconduct.
Accusing the Dealer of malfeasance implies they purposely intended to deliver a new tractor with a leaking connector.
Possible - but highly unlikely...
_
I paid Messick's to add factory rear remotes to my tractor. Got home with a puddle of hydraulic fluid on the gooseneck deck.
Brand new tractor leaking...sound familiar?
Tried to resolve the leak with no joy. Messick's found a bad O-Ring after I took it back in, and they replaced all the others in the new remote valve assembly while they were in there.
Had I gone into the discussion emotionally HOT, or accusing them of "malfeasance", do you think they would have gone the extra mile?
In spite of a mechanic screwing up an O-Ring install, I will continue to drive past three other Kubota dealerships to do business with Messick's because of their actions after the error to make it right.
Sure I wish it hadn't happened, but it did. We can only control how we positively respond (rather than react) to an event.
I choose to believe the vast majority of people are trying to do what is right and honorable in spite of a few individuals trying to instigate social strife.