Definition of 'grumbling'

See also: grumble 

Noun

1. a loud low dull continuous noise; "they heard the rumbling of thunder"
      Synonyms: rumble rumbling grumble
2. a complaint uttered in a low and indistinct tone
      Synonyms: grumble murmur murmuring mutter muttering

Adjective

1. continuous full and low-pitched throbbing sound; "the rumbling rolling sound of thunder"
      Synonyms: rumbling
2. muttering discontentedly; "the grumbling boarders requested a meeting with the cook"

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