Different from my top 10 favorite villains. This is based on their interactions with the protagonists and how their actions affect their world. This list is based on the repulsion factor. The ones who are higher on the list do reprehensible things with little to no understandable motivation and/or they go after easy (innocent, helpless) targets.

And finally, this list is skewed towards villains who are weaksauce because they dish out all this pain and grief but probably couldn't take it themselves. But also, especially brutal villains who 'fight' the heroes -- i.e. thrash them within an inch of their lives.

The fighting aspect is secondary, though, and their other actions might put them higher on the list.

This list leaves out Maleficent and Hades, since I can't gage how evil they are without a second viewing of Hercules and a first viewing of Sleeping Beauty. Xp. And as for the Horned King--I'm a bit wary about using the dark overlords, like Horned King and Chernabog. How do they affect their world outside of their dark realms?

10. Jafar - Aside from the fact that him being relatable making him seem less evil, there's also his strong motivations for doing things. Yes, making Jasmine his slave is sick and twisted, and he probably does lust after her to an extent, but the way he goes about it seems more like his desire for vengeance against the royal family. When Jasmine feeds him the apple?,  he spits some on her face. He wants to humiliate her as she's humiliated him during his many years of service to her and her father. When he says something about Jasmine being on the arm of the most powerful man in the world, it seems to be him enjoying (and abusing) his newfound power over his former masters rather than it being about lust for a helpless victim. And finally, during the infamous scene between Jasmine and Jafar, Jafar tells Jasmine to tell him about him--Jafar wants his own ego fed, and so it's not about his lust for Jasmine, but rather Jafar wanting to be the center of the world--again, it has to do with power.

Second main evil thing Jafar does--Jafar keeps on trying to kill Aladdin, but Aladdin isn't a helpless victim. He goes to such elaborate lengths (like the frame-up in Return of Jafar) because Aladdin is such a difficult enemy. They're at equal fighting prowess--Aladdin is agile and is rather good with a sword while Jafar has magic and then, also happily trades his humanity to fight Aladdin himself. He fights well as a snake. They're equally bold, taking each advantage they can get, and they're mentally matched as well--Jafar comes off as lesser so since he's more impulsive--but in any case, Jafar's so low on the list because of his motivations and his victims aren't innocent, helpless victims.

But, whatever the motivations, Jafar enslaving Jasmine and the sultan is evil. It doesn't help that when he wins he's on the sultan's throne with all of this treasure around him, enhancing his decadence and evil. Not to mention, when he wins, he becomes overbearing and abusive.

9. King Candy/Turbo - Chessmaster extraordinaire, and is so low on the list because he gleefully loses his humanity and fights Ralph himself, head-on. Candybug is stronger, but it's not as much of a curb-stomp as number 2. Before that, takes over Sugar Rush by trying to delete Vanellope's code which makes her a glitch. He seals away the racers' memories so Vanellope becomes public enemy # 1. He's so afraid of this little girl he chains her up in his fungeon---and if that's not some kind of implied torture room,  I don't  know what is. OO He does torment Vanellope by having turned all of Sugar Rush against her, and his weak or non-existent motivations for wanting to rule Sugar Rush (aside from always having been the greatest racer ever) earn him number 9 on the list.
8. Shan Yu - Slaughtered a village, and before going there calmly mentioned the doll they should return to the little girl there. The discrete evil acts he does are few, but this village scene punches me in the gut every time.
7. Scar coldly lies to Simba, to lure him to the hyenas to kill him, and lies to him again to set him up for the stampede. He kills Mufasa and lies to Simba again so he'll run away and the hyenas can kill him again. Scar is not only cold and remorseless but he uses the hyenas to do everything except kill Mufasa, as if dealing with Simba  himself is beneath him. Then he has the gall to blame the loyal  hyenas and the way he pulls out the family card is highly obnoxious. Oh yeah, and he slaps Simba's mom. He's lower than others on here because his evil reign is a more lethargic reign, and he seems to be playing a game of lethal tag with Simba, and only Simba.
6. Cruella De Vil - Wants to kill Pongo and Perdita's puppies and make fur coats out of them. Is really rough and abusive with her minions, too. Also, she wants these puppies so badly that she becomes a hideous driver. Oo Cruella gets points for describing the ways in which her minions can kill the puppies: "poison them, drown them, bash them on the head. You [ ] got any chloroform?" Also, she acts really entitled as if Roger and Anita are just going to give her the puppies. She tries to force Roger into a contract but fails.
5. Stromboli - Exploits sentient puppets D: Has Pinnochio go on stage, and rakes in the money that Pinnochio makes for him. He makes it seem that they have a partnership going on, but Stromboli locks up Pinnochio and if he doesn't make good then he'll chop him up... OO OO OO
4.  Ursula - her nasty contract she pressures Ariel into making is Ariel's voice for becoming human, and then if she doesn't get true love's kiss or whatever in three days then Ariel becomes Ursula's (her slave?) So Ariel loses her voice, might lose her freedom, and there's a deadline. Also, if the customer can't pay they get turned into stuff. And all of this stuff is just hanging around her place, aren't they? ::Shivers.:: Not to mention that Ursula didn't tell Ariel about the whole needing to breathe thing, forcing her to make a mad dash for the ocean surface before she drowns.
3. The Coachman - Luring boys to Treasure Island, and when the park closes and they become donkeys, take off all of their clothes OO and sends the non-talking ones to slave in the mines. OO OO OO OO ::Shudders.::
2. Ratigan - Drowned widows and orphans, had his cat eat one of his minions who called him a rat, while drunk, planned to kill Basil and Dawson while making them listen to a recording of Ratigan singing a catchy and sadistic song and when that song ends, Basil and Dawson will get killed by a Rube Goldberg. Ratigan also does what he does for the infamy, and wants to top his earlier work. Kidnaps, holds hostage an inventor and his daughter and forces him to build a robot Queen that will support his rise to power. When he proclaims himself king, he announces he'll tax all 'parasites', i.e. old people and children. (and handicapped people?) He kills his own loyal minion to "lighten the load", and when his plans go awry, he tries to not only tries to kill Basil but rips up his clothes in a way that's more invasive than any other Disney villain, in my opinion. It's a bloodless, but brutal thrashing.
1. Frollo - tried to drown Quasimodo. Only didn't because he feared for his soul and because he figured he could use Quasimodo later on. Kept him not only as his slave but imprisoned him in the Notre Dame bell tower through emotional abuse. Let Quasimodo get tortured by the crowd. Wanted to kill all of the Roma. Burned down peasants' homes that he thought were harboring the Roma. Tried to have Esmeralda executed because she wouldn't sleep with him. Unlike #3-10 who try to kill individuals or a small group of people, Frollo is bent on and attempts genocide. The attempted genocide is through sanctioned means of execution--and since Frollo is the only authority in the city, he is, for all purposes, king. Which makes him more despicable since there's no one above him giving him orders. And finally, coldly carries on a conversation with Phoebus while some poor guy is getting flogged in the next room.

And finally, Frollo believes everything he does is right.