積せっ極きょく行こう動どう主しゅ義ぎ者しゃ

noun

activist

Refers to a person who actively engages in social or political action based on their beliefs. The term is a compound of 積極 (positive, proactive), 行動 (action), 主義 (principle, doctrine), and 者 (person).

• 彼かれは環かん境きょう保ほ護ごのための積せっ極きょく行こう動どう主しゅ義ぎ者しゃとして知しられている。

  He is known as an activist for environmental protection.