Adverb
in a maniacal manner or to a maniacal degree
Source: WordNethe was maniacally obsessed with jealousy Source: Internet
Both enjoy solving problems and cases as maniacally as possible, often with complete disregard for the law. Source: Internet
He then rams his head into the mirror and, while laughing maniacally, repeatedly mocks his earlier question about Annie's condition. Source: Internet
While scouting the Imperial base on Endor, Paploo decided to make a risky gambit and steal one of the Imperial speeder bikes parked nearby, screaming maniacally as he did so. Source: Internet
The "laughing room" scene, where all the objects in the room seemingly come to life and begin to cackle maniacally along with Ash, came about after Spiegel jokingly used a gooseneck lamp to visually demonstrate a Popeye -esque laugh. Source: Internet
When asked about his fate, Secretary of State Hillary Clinton cackled maniacally: "We came, we saw, he died." Source: Internet