grumbling

1. is a type of: noise - sound of any kind (especially unintelligible or dissonant sound)
   same as: grumble, rumble, rumbling
2. is a type of: complaint - an expression of grievance or resentment
   same as: grumble, murmur, murmuring, mutter, muttering

1. similar to: full - (of sound) having marked deepness and body
   same as: rumbling

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