Extremely evil (7)
(Other definitions for wicked that I've seen before include "Foul, evil" , "Absorbed in enchanting" , "Evil or morally wrong" , "Ungodly; excellent (sl.)" , "Very bad, or very good nowadays" .)
(Other definitions for villainous that I've seen before include "really bad" , "dramatically bad" , "Nasty" , "criminal" , "very unpleasant" .)
(Other definitions for demonic that I've seen before include "Like a devil or evil spirit" , "Resembling evil spirits" , "Dime con (anag.)" , "Wicked" , "Cruel like the devil" .)