While there are different types of intelligence, for the sake of this discussion I am referring to people who are â€œbook smartâ€ (meaning they do well in school).
At the very lowest levels of intelligence, attractiveness is also low for obvious reasons.
The first thing that comes to mind is physical attractiveness: being in good shape, being well groomed, having attractive features, or dressing well.
Some scientists think that attractiveness is related to the symmetry of our facial features.
The more intelligent a person is, the more he overanalyzes himself to the point of killing his confidence.