꽤

In a sentence

• 그 책은 꽤 재미있다.

  That book is quite interesting.

  In this sentence, '꽤' is used to indicate a moderate level of emphasis or degree, implying that the book is significantly interesting, but not to an extreme level.

• 꽤 많이 준비했어요.

  I prepared quite a lot.

  Here, '꽤' modifies '많이' to describe the preparation done to a notable, though not excessive, extent.

• 영어를 꽤 잘하시네요.

  You speak English quite well.

  In this example, '꽤' is utilized to compliment someone's skill level positively without being overly strong.