Sulkily
/ˈsʌlkɪli/
Definition 1 of 1
Pro Tip 1/3Emotional Indicator
Shows a negative emotion without stating it directly, suggesting the person is quietly unhappy or resentful. 
She listened to the criticism sulkily, her arms crossed.
Pro Tip 2/3Not Always Vocal
Can describe silent expressions of unhappiness, like a frown or a scowl, not just verbal responses. 
After the argument, he sat in the corner sulkily.
Pro Tip 3/3Childish Connotation
Often associated with behavior expected more from children than adults, implying immaturity. 
He sulkily kicked the dirt, looking very much like a scolded child.