Okay, let's start with Jane Austen. (Surprise there, right?) Which do I hate the most... Willoughby (Sense and Sensibility), Wickham (Pride and Prejudice) and Henry Crawford (Mansfield Park) are the first three who come to mind. Not sure which one is the worst... the W's are both similar; they put on a show of being splendid, dashing, honorable gentleman, when in fact they are dishonorable and have sordid pasts involving women. (eww.) Willoughby seems a little less scoundrel-y in some ways... he shows a bit of remorse for some of his actions (although mainly because things didn't work out the way he wanted) and seemed to have more real feeling. However, he purposely set out to amuse himself by winning Marianne's heart only to break it. That's just evil. Wicked Wickham didn't exactly do that... but but he's more all-around jerk-like and slime-bag-ish, I think. Sort of less human, almost, than Willoughby. But... I hate them both.
And Henry Crawford... ugh. Some people seem to think he shouldn't have ended up being the villain, to which I say, WHAT. Um. Just don't get me started, okay? HATE. THE. RAT.
Oh, and John Thorpe (Northanger Abbey) is SO. ANNOYING. That's the main thing with him--he just drives me up the wall. Frederick Tilney actually has more dastardly-villain material... CREEP. But he isn't mentioned much.
William Elliot (Persuasion) deserves a good deal of villain points, and I give more of said points to Frank Churchill (Emma) than the average person seems to. ;)
Moving on from Jane Austen... Charles Dickens seems to have a good collection of dastardly villains. I hate them in different ways. Some of them are less of the evil-scheming-villain type and are more disgustingly annoying. Examples: Mr. Smallweed (Bleak House... pictured above, see how gross? :P), and Mr. Squeers (Nicholas Nickleby). Although the latter had his share of deviousness, too. Mr. Pecksniff in Martin Chuzzlewit REALLY rubs me the wrong way... but at least he gets somewhat of a comeuppance.
There are the ones who just seem slimy (Uriah Heep, David Copperfield) and the ones who totally creep me out... like Bradley Headstone (Our Mutual Friend), John Jasper (The Mystery of Edwin Drood, at least the BBC version... some people say he isn't really a villain, but he creeps me out, okay?), and certainly not least of all, Blandois/Rigaud from Little Dorrit. That guy is probably the worst Dickens villain out there, but I don't really love to loathe him. I just shudder and wait for him to die. :P
I really, really, really hated Jonas Chuzzlewit in Martin Chuzzlewit. I just... have no words. UGH. He combines disgustingly-annoying with you-make-me-so-mad-I-wish-somebody-would-push-you-off-a-cliff. The uncle in Nicholas Nickleby was of the cold-hearted and devious sort who makes me quite angry... he and Mr. Tulkinghorn from Bleak House seem like two of a kind.
It seems like a lot of my favorite stories don't really have particular villains that really make me pay attention to them... one I have to mention, though, because I hated him so much, was Mr. Grandcourt from Daniel Deronda. I watched this with someone who employed the fast-forward button not infrequently, haha, but I saw enough of him to know that he was very evil and wicked and black of heart, and nearly the whole entire time I was just WILLING him to DIE.
There. Was that enough ranting for today?
Oh, yeah, that creepy villain dude in Lorna Doone. Ew. He's another one where I wish he would go jump off a cliff. Or into some quicksand or something. :P