- Distant traffic noise - Hum - Low, indistinct sound - Mutter in discontent - Quietly spoken utterance - Speak quietly - A low, confused, and indistinct sound, like that of
running water.
- Rumour - Soft speech - Speak softly - Talk very softly - To speak softly, or under the breath, so as to be heard
only by one near at hand; to utter words without sonant breath; to talk
without that vibration in the larynx which gives sonorous, or vocal,
sound. See Whisper, n. - To make a low, sibilant sound or noise. - To speak with suspicion, or timorous caution; to converse
in whispers, as in secret plotting.
- Grumble - Mumble - Speak quietly - To utter words indistinctly or with a low voice and lips
partly closed; esp., to utter indistinct complaints or angry
expressions; to grumble; to growl. - To sound with a low, rumbling noise. - To utter with imperfect articulations, or with a low
voice; as, to mutter threats. - Repressed or obscure utterance.