I have quite a bit, although I don't really know the greatest one! I'm quick to annoy/upset and I will confront people if I believe they're being fake or lying (then again, some people think being confrontational isn't a flaw, who knows ^^), I'm fickle, I can hold long~ grudges against people who did something wrong if they don't apologize, I'm too forgiving when they do apologize, I'm afraid of way too many things (heights, spiders, aging, etc etc the list goes on), I don't forget things and tend to dwell on the past.

I can go on for a long time, but I'm too lazy to think anymore. xD Huh, that might be my biggest flaw, laziness.