mumble (mumbles plural & 3rd person present) (mumbling present participle) (mumbled past tense & past participle )If you mumble, you speak very quietly and not at all clearly with the result that the words are difficult to understand. verb
Her grandmother mumbled in her sleep... V
He mumbled a few words... V n
`Today of all days,' she mumbled. V with quote
Mumble is also a noun., n-count
He could hear the low mumble of Navarro's voice.