This is the 18363rd most frequent Korean word.
슬기로운
Wise; prudent; sagacious.
Here, "슬기로운" modifies the noun "선택" (choice), emphasizing thoughtfulness and intelligence.
슬기로운 선택이 성공의 열쇠이다.
A wise choice is the key to success.
In this sentence, "슬기로운" describes the manner "방법" (way), characterizing it as discerning and effective.
그녀는 항상 슬기로운 방법으로 문제를 해결한다.
She always solves problems in a wise way.
"슬기로운" in this example qualifies "삶" (life), suggesting a life lived with wisdom and prudence.