Specifically, "Unmerged Match" means that the profile manager agrees that the two profiles probably are the same person, but they are not ready to be merged. This typically is because there is a conflict in dates or parents. Sometimes there is just not enough information to complete a merge with confidence. For instance, I would not merge people named John Smith willy-nilly! There is every reason to believe that two people of that name lived in the same town.
The next step would be to do some more research and try to substantiate parents, dates, etc.