maniac
/ˈmeɪnɪæk/noun
1- a person exhibiting extreme symptoms of wild behaviour, especially when violent and dangerous（尤指有狂暴与危险外在表现的）疯子, 狂人：
a homicidal maniac.
杀人狂。
1.1
- with adj. or noun modifier informal an obsessive enthusiast〈非正式〉入迷于…的人, 热衷于…的人：
a religious maniac.
宗教迷。
1.2
- Psychiatry, archaic a person suffering from mania【精神病学】〈古〉躁狂者, 躁狂症患者。
派生词
maniacal
/məˈnaɪəkəl/ adjectivemaniacally
/məˈnaɪəkəlɪ/ adverb词源
early 16th cent. (as an adjective)： via late Latin from late Greek maniakos, from mania （see MANIA）.