If I were the type to choose a partner, I’d say it’s very important for them to be not dumb, but less important to be actually smart. It would still be a positive, but someone who’s not a genius but still had many other good qualities can still be fun to hang out with. It’s also a mindset thing-- someone with little knowledge but a will to learn is better than someone who knows more, but refuses to learn anything new. (Not that knowledge == intelligence, anyways.)