grumbling

noun

a complaint uttered in a low and indistinct tone
低く不明瞭な声調で文句を言うこと
a loud low dull continuous noise
大きくて低くて鈍い連続した騒音
- they heard the rumbling of thunder
  彼らは雷がゴロゴロいう音を聞いた

adjective

continuous full and low-pitched throbbing sound
連続的に充満した低音域のずきずきしている音
- the rumbling rolling sound of thunder
  定期的に雷が鳴る音

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