Sullenly

He turned to his orange juice sullenly, sneering that every little additive would sign him up for experiments he wanted no part in.

Source: tatoeba (754821)

On the ledge of rock above this strange couple there stood three solemn buzzards, who, at the sight of the new comers, uttered raucous screams of disappointment and flapped sullenly away.

Source: tatoeba (6310908)

"Past me was a weak, wimpy, ineffectual little thing," Alice stated sullenly, "a total doormat, the kind of person that would let you walk all over her. She was more concerned with being a 'good girl' and getting along with everyone and not making waves than expressing her true feelings." She shook her head, then turned to stare Linda square in the eyes. "But you… you changed all that. And for the better. You got me to brush aside my totally PC façade and just express the inner me."

Source: tatoeba (13557966)

A grim meaning rose in the vacuous eye of Lovel; Isaacs caressed his diamond pin, smiling in a sickly fashion; McNamara's wandering stare fixed and grew unhumanly bright; Ufert openly dropped his hand on his gun-butt and stood sullenly defiant.

Source: wiktionary