What are they for, and how can we keep them looking, well, unnoticeable?

They learned to become unnoticeable in the middle of all this.

She knew from experience, however, that the effect would quickly become unnoticeable.

To drive, the system is very good and virtually unnoticeable.

The little black box was virtually unnoticeable in the night.

"If there were they had faded so much as to be unnoticeable among all the bad new ones."

Both the gesture and the nod were small, all but unnoticeable.

You can be sure they've killed other animals, but on an unnoticeable scale.

There was an almost unnoticeable delay while his words were translated.

"You wrote me it was nearly unnoticeable," she said angrily.

Very slight differences exist between them but most are almost unnoticeable.

Mild symptoms may be almost unnoticeable, just making you feel a little "off."

But her eyes were looking at a small, almost unnoticeable bulge in his coat.

Rips in these areas are very common and mostly unnoticeable.

If she is, her action is at such a low level as to be unnoticeable.

Blood in the stool may be obvious to the eye or unnoticeable.

Her head swung an unnoticeable quarter of an inch each way.

The alteration had been neatly done, and was almost unnoticeable.

They may be so tiny as to be almost unnoticeable.

The process is difficult and expensive but is almost unnoticeable.

She could look like anybody, or make herself unnoticeable.

In the right state of mind, a witch can make herself so unnoticeable that she is almost invisible.

Alfredson wanted to make them very subtle and almost unnoticeable.

For the family it was a place to traverse when coming in or going out: familiar, unnoticeable.

The holster was unnoticeable unless one knew precisely where to look.