Advance ㅅ faithfully in Korean: 성실히’s meaning and pronunciation faithfully in Korean is 성실히. For examples, you can use like [성실히 공부하다, 성실히 답변하다]. In this post you will learn how to pronounce and use faithfully in Korean along with examples. 2022.12.21 Advance ㅅAdvanced WordsWordsㅅ