刻こっ苦く精せい励れい

noun, noun or participle which takes 'suru'

diligent effort; hard work; strenuous endeavor

A yojijukugo describing the act of working hard and persevering through difficulties. Often used in formal or written contexts to praise dedication.

• 彼かれの刻こっ苦く精せい励れいの末すえの成せい功こうは、多おおくの人ひとに感かん動どうを与あたえた。

  His success after years of diligent effort moved many people.

• 学がく生せい時じ代だいは刻こっ苦く精せい励れいして研けん究きゅうに打うち込こんだ。

  During my student days, I devoted myself to research with strenuous effort.