こっくせいれい 刻苦精励 LinksSentence search for 刻苦精励Sentence search for こっくせいれいKanji details for 刻, 苦, 精 and 励Edit in JMdict Noun, Suru verb1. being arduous; working diligently enduring hardships; making a strenuous effortYojijukugo (four character compound) Discussions Log in to talk about this word.