With the following definition:
To lower in quality or character.
corrupt, pervert, subvert, demoralize, demoralise, debauch, debase, profane, vitiate, deprave, misdirect
However all of those have a very "intentionally evil" connotation. I would say more along the lines of "messed up", but it needs to portray that it's somewhat intentional, just not with the evil slant.
Intentionally done, but unintentionally wrong, is what I'm looking for.
My nick name on here is Aequitarum Custos, which is a "bastardized" Latin, it should have been Aequitatis Custos (the correct way to say what I wanted).
I intentionally created my nick like that, but had no intention to make it wrong.
Reason for desiring a synonym is due to the perceived obscenity of the word bastard by some people.