Grumpily
/ˈɡrʌmpɪli/
Definition 1 of 1
Pro Tip 1/3Negative Mood
Use 'grumpily' to describe actions done with annoyance or irritability. 
She grumpily slammed the door after the argument.
Pro Tip 2/3Not Always Loud
'Grumpily' can express quiet discontent, not just noisy complaints. 
He grumpily scrolled through his phone, ignoring everyone.
Pro Tip 3/3Body Language
When 'grumpily' is used, imagine a person's body language as unhappy or displeased. 
She grumpily packed her bag, her shoulders hunched.