undetected

adj.未被发现的,未被识破的

未被发现的；未被察觉的

形容词

1. The virus remained undetected in the system until it caused significant damage.
这个病毒在系统中未被察觉，直到造成了重大的损害。

2. The thief managed to escape undetected by the security cameras.
小偷成功地在监控摄像头未觉察的情况下逃脱了。