I dislike people who can't challenge me intellectually. But at the same time, I dislike people who are clearly much smarter than me and rub it in my face, intentionally or not. I also dislike people with no depth. You can be on my level intellectually, but if you have no personality beyond that, just go away. I like interesting people.
Physically, unclean people turn me off. Make-Up turns me off too. In small quantities it's ok, but slapped on like a clown's mask is definitely not ok (not to mention I hate clowns >_<). I also dislike body hair. The hair on your head is fine. Elsewhere not so much, get rid of it. Also, loud people turn me off. I prefer quieter people, who can be outgoing, just not like... Super-in-your-face outgoing.