活躍: activity or success. The Japanese verbal noun '活躍 (かつやく)' refers to being active, energetic, or successful in a particular field or endeavor. It is often used to describe someone who is making significant contributions or achieving notable success in their work, sports, or other activities. For example: He is very active in the business world「彼はビジネス界で大いに活躍している」(かれはビジネスかいでおおいにかつやくしている). She succeeded in her new role「彼女は新しい役割で活躍した」(かのじょはあたらしいやくわりでかつやくした). The word can also imply a sense of dynamism and prominence in one's actions.