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翻訳中、読み込み中…He tends to mumble when he's nervous.
to speak in a low and indistinct manner, often making it difficult to understand what is being said.
Do not mumble your words.
She mumbled a quiet apology.
He mumbled, "I don't know."
mumble a response
mumble incoherently
mumble under one's breath
stammer
murmur
utter indistinctly
