Of all their faces, his was the most unnerving.

They were a dark enough blue to be black in this light, and looking into them at close range was most unnerving.

His conversation with the gentleman had been most unnerving.

The eyes themselves were the most unnerving evidence of her ordeal.

The quietness, the utter loneliness was what they found the most unnerving.

"It can be most unnerving, particularly when there is no lady of the house."

That was true, and perhaps the most unnerving part of the whole day.

The most unnerving thing about group invisibility was that your group could tell no difference.

The sound of the shapeshifting in such a quiet and enclosed space was most unnerving.

The most unnerving thing is that I have been part of this project from the beginning.