well-concealed

Several years ago, I visited a well-concealed complex behind a furniture showroom in suburban Seattle.

The explanation of this phenomenon appears to be the fact that the nest is well concealed high up in a tree.

If they are well concealed it is unlikely anybody would discover them.

The nest of this shy little summer visitor is usually well concealed near the ground, in the middle of a thick bush.

It was a barred door, within a closet, covered over with clothes and uniforms so as to be fairly well concealed.

She was as well concealed as she could manage, and yet her femininity seemed to be emphasized by her very disguise.