Best in women: Personal strength. There is nothing so attractive to me, than a woman that is strong, knows she is strong, and is capable of being a woman within that strength.
Worst in a woman: Expecting her man to know what she means when she speaks (and it is rarely what she says). If you want to say something, then say what you mean, and mean what you say, because that is how I am going to respond.
Best in men: Self-control. Do not tell me that you can fight in combat, but cannot kill a spider. Deal with it.
Worst in men: Liars. I cannot stand them. It is so much easier to tell the truth. And you do not have to keep track of what lies you have told to whom.