ma·ni·ac 
/ˈmeɪniˌæk/ noun
plural ma·ni·acs /ˈmeɪniˌæk/ noun [count] 1 : someone who is violent and mentally ill
▪ The movie he rented was about a maniac [=madman, lunatic] who goes on a murderous rampage. ▪ a homicidal maniac 2 informal : a person who behaves in a very wild way
▪ He's a complete maniac when he's playing football. ▪ She drives like a maniac. [=she drives in a very reckless and dangerous way] 3 informal : a person who is extremely enthusiastic about something
▪ His friends are all sports maniacs. [=fanatics] ▪ a movie maniac [=freak]
▪ The movie he rented was about a maniac [=madman, lunatic] who goes on a murderous rampage. ▪ a homicidal maniac
▪ He's a complete maniac when he's playing football. ▪ She drives like a maniac. [=she drives in a very reckless and dangerous way]
▪ His friends are all sports maniacs. [=fanatics] ▪ a movie maniac [=freak]
— maniac adjective always used before a noun [more maniac; most maniac]
▪ maniac killers/fans
▪ maniac killers/fans
— ma·ni·a·cal /məˈnajəkəl/ adjective [more maniacal; most maniacal]
▪ a maniacal killer/fan ▪ She let out a maniacal laugh. ▪ maniacal sports fans
/məˈnajəkəl/ adjective [more maniacal; most maniacal] ▪ a maniacal killer/fan ▪ She let out a maniacal laugh. ▪ maniacal sports fans
— ma·ni·a·cal·ly /məˈnajəkli/ adverb
▪ laughing maniacally
/məˈnajəkli/ adverb ▪ laughing maniacally
