I'm open to a wide variety of expressions in terms of intelligence and aptitude. Both can present in one or many areas. All are appreciated as long as there's a continuing curiosity about the world and desire to learn and understand more about the world.
Apart from bearing, confidence is not something I can see. However, I know genuine confidence when I meet and interact with the person. Imo, usually they're a little self-possessed, yet comfortable approaching others as an equal without condescension, just this is who I am and show me who you are kind of attitude.
He or she is a person one can exchange thoughts, feelings, opinions with and find common ground on some issues, disagree on others and not feel threatened. Can give a compliment and not expect one back. Receive a compliment and say thank you. Hear someone hand out a compliment to another person and offer congratulations, not say, "hey, what about me??"
Like intelligence, there are a variety of expressions, as some people can be generally confident while others tend to be more confident in some things, not others. As long as there's a good foundation of self-respect and respect for others I can work with it.