Japanese Idioms, Phrases & Proverbs

Yojijukugo (4-Character Idioms)

刻苦精進 こっくしょうじん kokkushoujin
刻苦勉励 こっくべんれい kokkubenrei
刻苦精励 こっくせいれい kokkuseirei
精励刻苦 せいれいこっく seireikokku