Sentence:  Theſe gentlemen, with an equal ſhare of pride, pedantry, and <WSD>ſaturnine</WSD> diſpoſition, were by the accidents of education and company, diametrically oppoſite in political maxims; [...] 
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.