| Mumble |
| Grumble |
| Say inaudibly |
| Vater's spouse |
| Speak unclearly |
| Be hard to hear |
| Not say clearly |
| Murmur complaints |
| Speak indistinctly |
| Murmur indistinctly |
| Say under one's breath |
| Speak under one's breath |
| Barely audible utterance |
| Under-one's-breath sound |
| [Grumble, grumble, grumble] |