mutterer

Từ điển WordNet v3.1 - WordNet Dictionary

noun

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