GRUMBLING

• (noun) a complaint uttered in a low and indistinct tone

  synonyms : grumble , murmur , murmuring , mutter , muttering

  The children muttered when the teacher gave them another homework assignment. -added by naila_inlas

• (noun) a loud low dull continuous noise

  "they heard the rumbling of thunder"

  synonyms : grumble , rumble , rumbling

• (adj.) continuous full and low-pitched throbbing sound

  "the rumbling rolling sound of thunder"

  synonyms : rumbling

WordNet® 3.0, © 2006 by Princeton University.

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