There is bad (Something that went wrong or gives a bad feeling) , then there is worse and lastly there is worst. I will explain incorrectly for you to understand... there is bad... then badder (Worse) and lastly baddest (Worst). Badder is never used, it's incorrect... instead we say worse. As for the word baddest, it also incorrectly used because in these times it has become a Slang term for being Cool or popular. The correct way is bad, worse and worst.