a. 狂热的, 偏执狂的

[ adj ]
obsessed with a single subject or idea
<adj.all>

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.