研けん鑽さん

noun, noun or participle which takes 'suru', transitive verb

diligent study; devotion to one's studies; scholarly pursuit

Formal, somewhat literary word for sustained, serious study or research, often implying self-improvement or mastery of a field.

• 彼かれは日にち夜や研けん鑽さんを積つんで、ついに博はく士し号ごうを取しゅ得とくした。

  He devoted himself to diligent study day and night and finally earned his doctorate.

• 語ご学がくの研けん鑽さんに励はげむ。

  I apply myself to the diligent study of languages.