This is the 4226th most frequent Korean word.
지친
"Exhausted" or "tired."
In this sentence, '지친' is used as an adjective, describing the state of '얼굴' (face) as tired due to a hard day's work.
지친 얼굴을 보니 오늘 하루가 힘들었나 봐.
Looking at the tired face, it seems like today was tough.
Here, '지친' modifies '목소리' (voice), indicating that the voice sounded worn out or exhausted.
그는 지친 목소리로 도움을 요청했다.
He asked for help with a fatigued voice.
In this example, '지친' is used to describe '마음' (heart), emphasizing emotional fatigue or weariness.