murmurer

Từ điển WordNet v3.1 - WordNet Dictionary

noun

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