ADJ [ADJ after verb, ADJ n, verb-link ADJ]未被发现的；未被识破的；未被查出的 If you are undetected or if you do something undetected, people do not find out where you are or what you are doing. 未被发现的；未被识破的；未被查出的
...the spy ring had a fifth member as yet still undetected.
这个间谍团伙还有第五名成员未被查出。
They managed to get away from the coast undetected.