对一事狂热的人,偏执狂者
Monomaniac \Mon`oma"ni*ac\, Monomaniacal \Mon`oma"ni*a*cal\, a. [Cf. F. monomaniaque.] Affected with monomania, or partial derangement of intellect; caused by, or resulting from, monomania; as, a monomaniacal delusion.
monomaniacal adj : obsessed with a single subject or idea