mumble

Universal Words verb, noun verb to speak or say sth in a quiet voice in a way that is not clear SYNMUTTER: [V] I could hear him mumbling to himself. * [VN] She mumbled an apology and left. * [Vspeech] 'Sorry,' she mumbled. [also Vthat] noun [usuallysing.] (also mumbling [C,usually pl.,U]) speech or words that are spoken in a quiet voice in a way that is not clear: He spoke in a low mumble, as if to himself. * They tried to make sense of her mumblings.