maniac
//ˈmeɪ.ni.æk//
Noun
maniacSingular
maniacsPlural
1
A person who behaves in a wild, uncontrolled, or dangerous way.
He drives like a maniac and scares everyone on the road.
2
A person who has an extreme enthusiasm or obsession for something.
He's a fitness maniac who goes to the gym every day.
3
(dated) A person suffering from mania or mental illness.
In the past, maniacs were often confined to asylums.
Adjective
maniacCanonical form
1
Exhibiting wild or violent behavior; frenzied.
The crowd broke into maniac cheering when the team scored the winning goal.