What is the Norwegian word for Bastard?
It depends what the original context the word was used in the
English language. I would presume that we are talking about a child
who is born outside of wedlock, in that case the the norwegian word
"uekte" witch directly translates "unreal" would be correct to
use.
However Norwegians also use the word "bastard" (pronounced
baSStard) referring to dogs who are of mixed breeds.