1. I'm absolutely sure. 2. I'm positive that... 3. I have no doubt that... 4. I'm a hundred percent certain. 5. I'm convinced that... 6. Chances are that... (= this will probably happen) 7. Odds are that... (= this will probably happen) 8. I seriously doubt it. 9. I don't think so. 10. Probably not. 11. It's not very likely. 12. There's not much chance of that. 13. I'd be very surprised if that happened. 14. I wouldn't bet on it. (= there's a small chance it could happen... but it probably won't happen) 15. That'll never happen.
People feel important when they're with you because you always seem to understand their point of view. You are considered warm and outgoing because you know how to draw people out, and you're thought of as someone with an unparalleled ability to deal with the public. However, because you want others' approval, you tend to go along with what they want and this sometimes makes you look wimpy. To some people, you also appear vain and overly concerned with your appearance.