| Word | Definitions | Synonyms |
|---|---|---|
| grumble | (verb) make complaining remarks or noises under one's breath | Synonyms: croak, gnarl, murmur, mutter |
| (verb) show one's unhappiness or critical attitude | Synonyms: grouch, scold | |
| (verb) to utter or emit low dull rumbling sounds | Synonyms: growl, rumble | |
| (verb) make a low noise | Synonyms: rumble |