MUM'BLE, verb intransitive 1. 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. --A wrinkled hag, with age grown double, Pickling dry sticks and mumbling to herself. 2. To chew or bite softly; to eat with the lips close. MUM'BLE, verb transitive To utter with a low inarticulate voice. He with mumbled prayers atones the deity. 1. To mouth gently, or to eat with a muttering sound. 2. To suppress or utter imperfectly.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI