This is the 9166th most frequent Korean word.
걱정스러운
Worrisome.
걱정스러운 is used as an adjective to describe '표정', indicating the expression shows worry.
그녀는 항상 걱정스러운 표정을 짓는다.
She always has a worried expression on her face.
걱정스러운 qualifies '소식', emphasizing the news is causing anxiety.
걱정스러운 소식을 듣고 모두가 조용해졌다.
Upon hearing worrying news, everyone became silent.
걱정스러운 modifies '태도', implying his attitude is full of concern.