The most common Korean word for “effort” is 노력 (noryeok). 「effort」는 한국어로 노력.
Learn 노력 free — flashcards, audio and review →「노력」 단어장으로 무료로 외우기Words and levels: TOPIK I essentials (National Institute of Korean Language standard curriculum, KOGL Type 1) · examples: Cheesepotato