Meanings of sullen moroseness in English

His sorrow had deepened this to a sullen moroseness that could not brook even the savage companionship of the ill-natured baboons.

His face overgrown with hair and pitted with smallpox, and his eyes scarcely visible under thick, overhanging eyebrows have an expression of sullen moroseness.

He alternates between sullen moroseness, when he won't speak a word, and the most violent outbursts of temper, when he smashes everything within reach.

The arduous task which she had performed a short time before for her widowed sister had increased the seriousness of her disposition to sullen moroseness.