monomaniac
對一事熱狂的人,偏執狂者
mono·ma·ni·ac /-nɪˌæk/ 名詞
偏狂者,偏狂的
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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Mon·oma·ni·ac n. A person affected by monomania.
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monomaniac
n : a person suffering from monomania