siak-sim悉心

devoting all one's attention

devoting all one's attention; taking the utmost care; wholeheartedly

adverb

English Wiktionary, “悉心” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E6%82%89%E5%BF%83 · confidence: Medium (Wiktionary, Hokkien)