Anyway, to answer the OP's question...
I do consider intelligence to be important, but have no particular level thereof that I'd require in a future spouse, even if it were to be accuratly measurable. So I'll give some examples.
If, for some unfathomable reason, someone who were scarily brilliant and not crazy (or only mildly so) were interested in me, I'd be alright with doing the whole helper/support thing, and a good try at keeping up. That'd be cool, but not by any means to be expected. The difficulty is that often people who are tremendously smart in certain areas have very little ability to communicate what they're talking about to those who don't have much of a background, which means having to do a bunch of research just to talk to them, or learn the fine art of the pointed question, which gets old after a while (but is still fun, especially finding out about stuff I didn't even know that I didn't know).
somewhat high intelligence, but not scarily brilliant people I tend to get along best with, and I'd really try to find that, mostly because it's teriffic to be able to learn from each other. I'd rather give an example than a definition though, if that's alright. I have this friend, and we talk about stuff a lot, usually things we had in common. Sometimes, though, we talk about things he knows a lot about and I know of not at all, and visa-versa. So one day I was talking to him, and he started being happy and excited about Lisp, a computer programming language which is based upon the Lambda Calculus (created/discovered in the early 1950s), which is capable of traversing time to bring back the exact state of anything running something written in Lisp, from any point in time. I know absolutly nothing about computers, and didn't even think that I cared, but it just sounded so very interesting, and there were so many details, that I probed for information for about two hours, then got a book on it, did the excersises in said book, and now likewise enthuse, because Lisp is indeed a very cool thing.
That capacity for not only being interested in, but knowing well enough to do, explain, and link with other areas of interest, cool and unsual creations of the mind, is kinda what I mean by intelligence. And it's a bonus when a person uses "it's brain-meltingly difficult" as a joyous compliment to an area of study.
I'd put that kind of thing in opposition to not following thought for any length of time, or not well; having no interest in great ideas; not knowing or being bothered by how much they don't know; an inibility to recognize or analyze quality of though; vague or contentless thought and speech (speech and writing being our primary ways to convey the quality of our thought), not knowing what do without outside stimilation; can't or won't follow complex reasonings; don't know and remember things (facts, ideas, narratives, concepts, etc) of personal interest, and things of that nature. I try not to look at people and think that they're unintelligent though, and so shan't give any personal accounts of the above behavior.
