Sentence:  Hoag pushed open the door : at the far end of the long <WSD>dark</WSD> room Muller was faintly silhouetted against the window , the rifle still raised ; he stood with his feet apart on a kitchen table he had dragged to the sill . 
Meaning of the word marked with <WSD> tags:  devoid of or deficient in light or brightness; shadowed or black