grumbling

Noun
  1. A loud low dull continuous noise (synset 107407083)
    "they heard the rumbling of thunder"
    is a type of: noise - sound of any kind (especially unintelligible or dissonant sound)
    same as: grumble, rumble, rumbling
  2. A complaint uttered in a low and indistinct tone (synset 107225752)
    is a type of: complaint - an expression of grievance or resentment
    same as: grumble, murmur, murmuring, mutter, muttering
Adjective
  1. Continuous full and low-pitched throbbing sound (synset 301459887)
    "the rumbling rolling sound of thunder"
    similar to: full - (of sound) having marked deepness and body
    same as: rumbling

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