Spoiler for like, any book existing.
I think mine has to be the villain in Mirror Man. Idk, he wasn’t intimidating, he wasn’t interesting. He was meh.
Also the villains from The Chain. Dear God they weren’t sympathetic in the slightest. The book tries to act like they were atleast pitiful but FROM THEIR INCEPTION, they were just evil assholes who enjoyed causing pain. The book itself wasn’t all that great anyways.
Dickens created some world-class villains. Bill Sikes (Oliver Twist), Uriah Heep (David Copperfield), Mr Tulkinghorn (Bleak House), and Ralph Nickleby and Wackford Squeers (Nicholas Nickleby) come to mind. I think “evil asshole” as a descriptor fits any or all of these characters quite well.