I'd like to propose another dimension (or perhaps something that counts as a modifier to intelligence): confidence and cowardice. I would describe myself and my high school friends as, nearly universally, clever, lazy, and terrified. The difference between those who today find themselves in successful careers and those who don't is whether or not they acquired some measure of self-confidence in the interim. (If you noticed that this implies that such a personal quality is malleable - and further considered that uncontrollable circumstances might contribute to its shaping - well, yes.)