偏へん狂きょう

na-adjective, noun

monomania; monomaniac

A somewhat literary or technical term for an obsessive fixation on a single idea or subject. Can refer to the condition or a person with it.

• 彼かれは偏へん狂きょう的てきなまでに切きっ手て収しゅう集しゅうに没ぼっ頭とうしている。