Poor hygiene, lack of self-confidence (somebody in the relationship needs to have some self-assuredness!) general vapidity, self-absorption, insincerity, dull eyes - actually, the lack of any stand-out facial feature (eyes are big with me).
Lack of an appreciation for creativity (NB, while closer to my ideal, creativity itself is not a prerequisite - but I like to make things and I like to share them; utter disinterest in either weighed heavily in my decision to get a divorce a couple of years ago - as did the total lack of romance, passion, intimacy and, needless to say, sex).
Obese - that's a tough one. Thick or thin, all is beautiful, but obesity is a disease, and that's never pretty (neither is the other side effect: being the number one cause of preventable death in the US, having finally knocked smoking out of the title spot).
I have many, many flaws myself, and while I constantly work towards a daily reprieve from those flaws, a little understanding goes a long way.
Good post - made me think. Thank you!