This is the 19587th most frequent Korean word.
어렵다
Difficult.
어렵다 is used here to express the challenge or difficulty in solving a question.
이 문제는 정말 어렵다.
This problem is really difficult.
어렵다 takes the form 어렵게 to describe making conditions harder.
그는 상황을 어렵게 만들었다.
He made the situation more difficult.
어렵다 describes the process of learning as challenging, indicating effort involved.