IPA: /ˈmɜːrmər/
KK: /ˈmɜrmər/
A person who speaks softly or quietly, often in a low voice or in a way that is difficult to hear.
The murmurer shared secrets in hushed tones, making it hard for others to understand.
Murmurer → It is formed from "murmur" (from Latin "murmurare", meaning to murmur or grumble) and "-er" (meaning a person who). A murmurer is a person who murmurs or speaks in a low, indistinct voice.
Think of someone who 'grumbles' ('murmur') — the '-er' indicates that this person is doing the murmuring.