リゴリスト

noun

rigorist

A person who adheres strictly to a set of rules, principles, or moral standards, often in a religious or philosophical context. Relatively rare and academic in Japanese.

• 彼かれは宗しゅう教きょう的てきなリゴリストで、戒かい律りつを厳げん格かくに守まもっている。

  He is a religious rigorist who strictly observes the precepts.