lack of confidence in their body or the bedroom. All girls are insecure to some degree, especially hot ones. But a girl with a filled out body and full a$$ and tits that rocks you in the bedroom and rocks what she has is always hotter to me than an athletic girl with a perfect a$$ that is insecure.
Also: obsession with "shallow" things like social media, twitter, celebrities, reality TV, her phone, gossip, etc. This traits are a one way ticket to the "i will never date you" zone for me. A girl whom i date should also be a good friend that i can have interesting and stimulating conversations and share art and music and movies with.
personal hygiene/ sense of style. I make an effort to be well groomed and take care of my body and mind. She needs to shower regularly and be able to dress better than i do. In my experience girls who often wear sweatpants or don't wear makeup out or dont care about fashion... it only gets worse the longer you know them. Pretty soon you're 5 months into dating and she's lounging around in sweatpants and not showering before sex and my attraction is quickly wearing down.