sullenly

/ˈsʌlənli/
adverb
  1. In a way that shows silent bad temper or resentment; gloomily and unwillingly.
    • She stared sullenly out the window, refusing to speak to anyone.
    • After being told to clean his room, he sullenly picked up his toys one by one.
    • The workers sullenly returned to their stations after the pay cut was announced.
Antonyms
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