undetectable

"Is there something we could do which would be undetectable?"

What went on at that place was undetectable to her.

Perhaps they are the dark matter that is, so far, undetectable!

"Quite early on, your programs were very good but not undetectable."

He may come up with injuries undetectable to medical science.

Within three months, the virus was undetectable in 90 percent of patients.

And, she said, the virus is now undetectable in her blood.

However, the back stage self is still present, though undetectable.

Other times it was so faint as to be almost undetectable.

I'd heard that the visual effect was generally undetectable to human eyes.

"The whole thing is, everything that I've been doing at this point, it's all undetectable."

Progress had been virtually undetectable for most of the season, particularly in the last few weeks.

In visible light, it remained undetectable, no matter how close they came.

"My interest in your life would be undetectable even to the most powerful microscope."

To the rest of the vampire world, she was completely undetectable.

But from even a few yards away, it was virtually undetectable.

"They've advanced to the point where their ships are undetectable?"

Much of the time it is virtually and literally undetectable.

In his mind, he knew that their enemy was virtually undetectable.

The signal would be undetectable with any sort of modern equipment.

It too was undetectable by even the most sophisticated airport security.

Complex sounds such as these have an undetectable phase relationship.

Stops the heart and it's almost undetectable unless you're looking for it.

One that's both instantaneous and undetectable is in the works.

A thing encased in time, I should judge, would be undetectable.