Worst is the superlative form of bad: most bad.

Quotes

edit
  • I'm selfish, impatient and a little insecure. I make mistakes, I am out of control and at times hard to handle. But if you can't handle me at my worst, then you sure as hell don't deserve me at my best.
    • Misattributed to Marilyn Monroe in self-help books and on social media, this quotations are of unknown origin and date.
  • And worse I may be yet: the worst is not
    So long as we can say "This is the worst."
edit
 
Wikipedia
Wikipedia has an article about: