grumbly

/ˈɡrʌmbli/
adjective
  1. Making a low, rumbling sound, like a stomach or thunder.
    • We heard a grumbly noise from the basement, but it was just the furnace.
    • The old car's engine sounded grumbly as it started up.
    • My stomach felt grumbly because I hadn't eaten lunch.
  2. In a bad mood; tending to complain or be irritable.
    • He was feeling grumbly after losing his keys.
    • The grumbly customer complained about the wait time.
    • She gets grumbly when she doesn't get enough sleep.
Antonyms
What does "grumbly" mean? | whatsthatwordmean | whatsthatwordmean