Akademik

mumbler
noun
a person who speaks softly and indistinctly
Syn: ↑mutterer, ↑murmurer
Derivationally related forms: ↑murmur (for: ↑murmurer), ↑mumble, ↑mutter (for: ↑mutterer)
Hypernyms: ↑speaker, ↑talker, ↑utterer, ↑verbalizer, ↑verbaliser

Useful english dictionary. 2012.