精せい励れい恪かっ勤きん

noun, noun or participle which takes 'suru', na-adjective

assiduousness; diligent application to one's work or studies

A formal, literary yojijukugo describing wholehearted, persistent effort. Often used in speeches, essays, or formal writing to praise someone's dedication. Rare in everyday conversation.

• 彼かれの精せい励れい恪かっ勤きんぶりには、誰だれもが感かん心しんしている。

  Everyone admires his assiduous dedication.

• 精せい励れい恪かっ勤きんして学がく問もんに励はげむ。

  To apply oneself diligently to one's studies.