役やく者しゃ馬ば鹿か

noun

actor who is brilliant on stage but hopeless at everything else

Describes a person whose entire life revolves around acting, often to the point of being incompetent or clueless in daily matters. Can be used affectionately or critically.

• 彼かれは役やく者しゃ馬ば鹿かで、芝しば居い以い外がいのことは何なにもできない。

  He's a stage-obsessed actor who can't do anything besides acting.

noun

dedicated actor; actor who lives and breathes acting

Colloquial term for someone who is utterly devoted to acting, often implying a single-minded passion. The nuance can be positive (admirable dedication) or slightly negative (obsessive).

• あの役やく者しゃバカは、休やすみの日ひもずっと稽けい古こしている。

  That acting nut spends even his days off rehearsing.