(adj.) incapable of being traced or tracked down; 'an untraceable source' .
海耶斯校对
双语例句
His journeyings in India are untraceable; he was there fourteen years, and he went all over the peninsula from Nepal to Ceylon. 赫伯特·乔治·威尔斯.世界史纲.
You may see him--his hair stuck with wild flowers --his eyes full of untraceable meaning--his voice broken--his person wasted to a shadow. 玛丽·雪莱.最后一个人.