impalpably

Then the lurking and inevitable shadow of that life had impalpably and suddenly fallen upon him.

They were a long line of shadow shapes whose footfall made no sound, and whose pigmy bodies melted into the tangle as impalpably as the dissipating mists.

Miss Northrop stopped short and looked at him with brows a little raised, and her bearing became impalpably more distant.

What rich minerals float impalpably in your tawny waters?

The dust rose up impalpably and spoke to him.