Definition of 'grumbling'
See also: grumble
- a loud low dull continuous noise; "they heard the rumbling of thunder"
Synonyms: rumble rumbling grumble
- a complaint uttered in a low and indistinct tone
Synonyms: grumble murmur murmuring mutter muttering
- continuous full and low-pitched throbbing sound; "the rumbling rolling sound of thunder"
- muttering discontentedly; "the grumbling boarders requested a meeting with the cook"