This is the 18658th most frequent Korean word.
신뢰했던
"Trusted" or "had trusted."
신뢰했던 refers to the past aspect of trusting someone, indicating that trust existed but is no longer present.
그는 한때 신뢰했던 친구였지만 더 이상 그렇지 않습니다.
He was once a trusted friend, but he is no longer one.
Here, 신뢰했던 indicates a positive past assessment of the expert's competence and dependability.
우리는 신뢰했던 전문가의 지도에 따라 프로젝트를 진행했습니다.
We followed the guidance of a trusted expert to proceed with the project.
In this sentence, 신뢰했던 relates to books being sources of dependable information during one's childhood.