Traditional: 內心
内心 (nèi xīn) means “heart; innermost being; (math.) incenter”. It is an HSK 3 Chinese word (traditional 內心) in the HSK 3.0 vocabulary.
Practice each character:
他内心很善良。
Tā nèixīn hěn shànliáng.
He is kind at heart.
Updated: 2026-07-18