Sentence:  A <WSD>sombre</WSD> mood, very <WSD>sombre</WSD> in fact, thought Hennessey, as he stood against the wall observing the procedure for the police. He had not known a mood more <WSD>sombre</WSD> to have previously descended on the room. 
Meaning of the word marked with <WSD> tags:  Melancholy, gloomy, dreary, dismal; grim.