Malificent, tried to kill a royal family's daughter, therefore scaring them into hiding her. They never got to witness Arora grow up or anything, PLUS imagine having the only thing that can save her be the kiss of a stranger. ;/
Killed quasimoto's mom, tried to kill him too, lusts after gypsy girl and has that whole "hellfire" song
hands down Frollo, Ursula, and Scar are the best and most famous of all the villains for me. I mean not only do they each have this awesome musical number that's freaking amazing but they were each so wicked. Wicked to the point that in a twisted way you enjoyed them.
OK I have one thing about this thread that bothers me -
First I am asked who the worst villain is of all time.
Then I see people specifically asking about Disney movies.
People - DISNEY is not the real versions of these fairy tales. Honestly they are the watered down cherry on top version.
Worst Villain of all time? Tied between Rumpelstiltskin and The Queen from Snow White (she tried to make the King eat Snow's heart for god sake!)