fairly in Korean is 상당히. For examples, you can use like [상당히 멀다, 상당히 어렵다]. In this post you will learn how to pronounce and use 상당히 along with examples.
|상당히||adverb||相當 히相當 히||상당히|
|fairly; pretty||In a state in which a level, degree, or ability is quite high.|