A bore is someone who deprives you of solitude without providing you with company.
Jack? . . . No, there is very little music in the name Jack, if any at all, indeed. It does not thrill. It produces absolutely no vibrations . . . I have known several Jacks, and they all, without exception, were more than usually plain. Besides, Jack is a notorious domesticity for John! And I pity any woman who is married to a man called John. She would probably never be allowed to know the entrancing pleasure of a single moment’s solitude. The only really safe name is Ernest.