To mutter; to speak with the lips or other organs partly closed, so as to render the sounds inarticulate and imperfect; to utter words with a grumbling tone. Peace, you mumbling fool.

To utter with a low inarticulate voice. He with mumbled prayers atones the deity.

To mouth gently, or to eat with a muttering sound.

To suppress or utter imperfectly. I.