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maniacal (adj) mad and violent.
If a person is maniacal, they are wild because they are mad. They are violent because of their mental illness. They are even dangerous, because they are mad. Maniacal fury is the violent anger of a person who is either mad or whose anger is uncontrollable.
- The maniacal behavior of Sam in the office on hearing he had been fired shocked every one. He appeared to have gone mad and was throwing things about in the office. Police had to be called in to control him.
- He had maniacal enthusiasm for the game. He would think of nothing else but the game all the time. He would be very angry and wild if any one told him not to play or talk about the game.