1. (noun) rumble, rumbling, grumble, grumbling
a loud low dull continuous noise
Synonyms: gang fight, rumble, rumbling, murmur, grumbling, murmuring, grumble, muttering, mutter
Antonyms: thin
2. (adj) grumble, grumbling, murmur, murmuring, mutter, muttering
a complaint uttered in a low and indistinct tone
Synonyms: murmuration, mutter, mussitation, rumbling, murmur, grumbling, murmuring, grumble, rumble, heart murmur, murmur vowel, muttering, cardiac murmur
Antonyms: thin
3. (adj) grumbling, rumbling
continuous full and low-pitched throbbing sound
Synonyms: grumbling, rumbling
Antonyms: thin
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Synonyms for grumbling 
