Saeros
Destroyer of Worlds
I think you're making a fundamental error in your reasoning. Brave people can't be intelligent? Intelligent people can't be brave? Are courage and intelligence really so mutually exclusive as we would be inclined to believe? There are plenty of people who are courageous and extremely intelligent.
Given only the two options that you provided, however, i would choose, inexorably, "brave and dumbish".
Given only the two options that you provided, however, i would choose, inexorably, "brave and dumbish".