undetected

基本解释

This very simple scheme reduces the risk of undetected accidental failure to about 1 in 256.
这项简单模式将未被发现的意外故障的风险降低到约 1/256 。
In addition, using an aspect to implement FFDC ensures that no errors or exceptions go undetected, which can easily happen when it is implemented by hand.
除此之外，使用一个方面实现FFDC可以确保没有错误或者异常未被发现，如果手动诊断的话这个问题常常发生。
But viruses know their hosts well—they can break into cells undetected, switch off alarm systems, and undermine the cell's authority in deciding which genes get expressed.
但是，病毒知道他们的宿主---它们可以不被发现的侵入细胞，关掉警报系统，削弱细胞决定自身基因表达的权威。

"This capability allows the Strike Eagle to fly undetected, deep into enemy territory and deliver its ordinance."
"In 2008,the Greek Coast Guard reported the arrival of 2,648 unaccompanied children, but many more are believed to have entered the country undetected.

That is only natural after years in which anomalies have been left undetected or even concealed.
ECONOMIST: Chinese business
Subtle, undetected slippages in trust--not just big, one-off gaffes--can do plenty of damage, too.
FORBES: Do Your Customers Trust You?

If you are undetected or if you do something undetected, people do not find out where you are or what you are doing.