Sentence:  As the eye of the injured man slowly passed from the body of the seducer to the partner and victim of his crime, [...] his features, naturally coarse and <WSD>saturnine</WSD>, assumed a dignity of expression which overawed the young Templars, [...] 
Meaning of the word marked with <WSD> tags:  Of a person: having a tendency to be cold, bitter, gloomy, sarcastic, and slow to change and react.