In what way is Dimmesdale’s sin worse than Hester’s? Of Hester, Chillingworth, and Dimmesdale, whose sin is the worst? Why? In chapter 23.

Dimmesdale chooses to hide behind Hester and let her take the fall for their shared "sin". This certainly is cowardly and ironically the stress of this burden ends up killing him. I think Chillingworth is the most evil. He sets out to destroy Hester and Dimmesdale. Chillingworth's only motive was to punish and revenge.