喃喃鸣不平的，出怨言的；发牢骚；抱怨( grumble的现在分词 )；咕哝；发哼声；
1. 鸣不平的：grumbler 爱抱怨的人 | grumbling 鸣不平的 | grumblingly 报怨着
2. grumbling的近义词
2. 发牢骚：85. 谈论吸烟Smoking | 86. 发牢骚Grumbling | 87. 旅游及其他 Traveling and Others
3. (抱怨)：You've improved no end .你一直在进步. | 4grumbling,(抱怨) | That wasn't very good .那真不太好.
4. 嘀咕：4、挑食 picky eating; choosy about food | 5、嘀咕 grumbling | 6、容易(招误会) be apt to
noun
1. a complaint uttered in a low and indistinct tone
Synonym: grumblemurmurmurmuringmuttermuttering
2. a loud low dull continuous noise
e.g. they heard the rumbling of thunder
adj
1. continuous full and low-pitched throbbing sound
e.g. the rumbling rolling sound of thunder
Synonym: rumbling