않았던

In a sentence

• 어젯밤에 보지 않았던 영화를 오늘 봤습니다.

  I watched the movie today that I hadn't seen last night.

  Used in a relative clause to describe the movie that was not watched.

• 그가 주지 않았던 기회를 이제는 잡고 싶습니다.

  I now want to seize the opportunity he did not give.

  Used to indicate a prior action that was negated concerning the opportunity.

• 예전에 가지 않았던 장소를 여행했어요.

  I traveled to a place I had not visited before.

  Used to describe a location that was not visited before.