wide-eyed
adjective uk/ˌwaɪdˈaɪd/ us/ˌwaɪdˈaɪd/
睁大眼睛的
having your eyes open much wider than usual
轻信的;单纯的
too willing to believe and admire what you see or are told
At that time, I was still a wide-eyed youngster. 那时候我仍然是个单纯的孩子。