If her stomach protrudes further than her tits, or at the same level, I'm out. Also, the number if chins should never exceed one whilst the woman is standing up. A horrible thing to say, I know, but I briefly dated a generously-proportioned girl and it wasn't nice. I felt bad for not being attracted to her [despite her being a lovely person, personality-wise] and she didn't take well to being broken up with.
Also, if she's very religious, it's a no-go. I have very strong feelings about religion, namely that it can go and fuck itself in 98% of cases.
My dealbreakers? Awkward, opinionated, too quiet, allegedly sick sense of humour, needy, financially unstable.. The list goes on.