Simple past tense and past participle of mumble.(verb)
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Use "mumbled" in a sentence
"As Cusack saw clearly, Beckett was very much an Anglo-Irish Protestant, whose language resonates – "like a verse of Isaiah, or of Jeremiah," as his narrator Molloy has it – as if in a bleak homily mumbled from the pulpit of a bare three-quarters-empty church."
"Then he heard his name mumbled in a hurried introduction and, as he raised his hat, saw this girl withdraw a small hand from a mitten and offer it to him."
"I jumped at the chance to write with Carly and what I wound up doing was sending this chord progression and a rough of the melody, and I just kind of mumbled over the chord progression of this song and I sent it to her thinking it may be something she would be interested in writing on."