Definition of "uncurtained"

Its uncurtained windows were red with the sinking sun, as though bloodshot and inflamed from a too long unlidded existence.

1870, Bret Harte, Notes by Flood and Field

I was alone, but for my reflection in the uncurtained window.

1979, Angela Carter, “The Bloody Chamber”, in Burning Your Boats: The Collected Short Stories, New York: Henry Holt & Co., published 1996, page 129