Impossible. I tend to lean toward negative thinking, and this is something I am really working on, I decided to use the word impossible. More as a word to ponder. Not a word I want to have in my vocabulary.
Impossible is a limiting word. Wouldn't you agree? Nothing is impossible. Everything is doable with the right information and the right attitude. Succeeding at something doesn't always mean you have accomplished it, it means you have tried, you put your best foot forward, you have not limited yourself by shying away from something you thought was impossible.
So what have you done that you thought was impossible?