mumble
C2Substantiv/US /mˈʌmbəl/ MŬMB-əl; UK /mˈʌmbəl/ MŬMB-əl/
To speak with the lips partly closed, so as to render the sounds inarticulate and imperfect; to utter words in a grumbling indistinct manner, indicating discontent or displeasure; to mutter.
