1. in a bad-tempered and sulky manner; showing silent resentment or ill humor

Examples

• The teenager sullenly refused to answer when asked about his grades.
• She stared sullenly out the window during the entire car ride.
• He sullenly pushed his food around on his plate without eating.
• The workers sullenly returned to their tasks after the meeting.
• The child sullenly crossed her arms and turned away from her parents.
• The dog sullenly retreated to its bed after being scolded.