monomaniacal
(a.)對一事狂熱的人,偏執狂者
mono·ma·ni·a·cal /-məˈnaɪəkəl/ 形容詞
Mon·oma·ni·ac Mon·oma·ni·a·cal a. Affected with monomania, or partial derangement of intellect; caused by, or resulting from, monomania; as, a monomaniacal delusion.
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monomaniacal
adj : obsessed with a single subject or idea