Undetectable

Pastafarians believe that an invisible and undetectable Flying Spaghetti Monster created the universe.

Many of the changes that happen are undetectable to the eye.

Sami used an undetectable poison to kill Layla.

What’s more, only 28 percent of Americans living with HIV have received enough treatment to have undetectable viral loads in their blood.

In these days of “rolled” gold, electro-plate, and undetectable pearls, it is curious that almost the only honest Ersatz material known to the goldsmith's art should be utterly forgotten.

A trial of scar may be justified in a woman with a previous cesarean section who is currently on HAART, has an undetectable virus and spontaneously goes into labor.

“OK, so for a few weeks I've been working on a bit of a side project. I give you the Red Kriegtober.” “Um--” “Or the Red Octkrieger. I can't decide. It's a narco sub for transporting cocaine. It's totally undetectable by the Coast Guard. Thoughts?”

Some forms of data poisoning are undetectable. Attackers can insert adversarial noise into the training data, altering the training data in a way that is hidden to human observers.