The most striking similarity between Macbeth and Lady Macbeth besides their greed and ambition is their clear understanding of themselves and their ability as well as their willingness to share their thoughts and feelings with each other. They seem to be very well mated for such wicked people. They conspire against everybody and hide their intentions from everybody, but they are very open with each other. They make excellent co-conspirators. Ironically, Macbeth seems to be more effeminate in some respects than his wife. He is the one who shows and expresses fear, while she takes a leadership role and has to keep reassuring and comforting him. But this role reversal may be related to their close marital relationship. He may be expressing her fears and misgivings, while she may be deriving her strength of will from him. In fact, he may be more concerned about her safety than his own, and she may be more concerned about his success than her own. It is as if they are two persons joined in one. The assassination of Duncan would have been impossible without both of them working and thinking as one. Lady Macbeth has to drug the grooms, and later she has to go back and smear their faces with blood. Macbeth has to do the actual killinig, but she has to lay out the daggers and has to tell him how to behave after he returns with bloody hands. They know each other extremely well. They think alike. They seem to be alone against the entire world.