Here are my top three
1) Body odor. A guy doesn't have to wear a fancy cologne but he shouldn't reek. I meet a guy who was turned on after work outs and doing physical stuff, but his sweatiness was not desirable.
2) Bad Breath. Whether it's a partner, a friend, or a client, bad breath is a downer. Tobacco is the worst; complete non starter for me.
3) Confidence (Too much or too little). I like a guy who is comfortable in his own skin and knows what he is doing. Guys who are overly confident tend to be dicks and think they are God's gift to woman. I find them way too aggressive in the relationship. A guy with poor self confidence can be so exhausting, always looking for reassurance, and usually indecisive. I do want to say, "I'm not here to be your mom."