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