Mum"ble (?), v. t. [imp. & p. p. Mumbled (?); p. pr. & vb. n. Mumbling (?).] [OE. momelen; cf. D. mompelen, mommelen, G. mummelen, Sw. mumla, Dan. mumle. Cf. Mum, a., Mumm, Mump, v.] 1. 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.

Peace, you mumbling fool.

A wrinkled hag, with age grown double,
Picking dry sticks, and mumbling to herself.

2. To chew something gently with closed lips.

Mum"ble (mŭm"b'l), v. t. 1. To utter with a low, inarticulate voice. Bp. Hall.

2. To chew or bite gently, as one without teeth.

Gums unarmed, to mumble meat in vain.

3. To suppress, or utter imperfectly.

• (transitive or intransitive) to speak unintelligibly or inaudibly; to fail to articulate
       Could you try not to mumble so I can hear you better?
  
• (countable) an quiet or unintelligible vocalization
       All I could hear was a mumble from the next room.
  
• (countable) a low tone of voice
       He spoke in a mumble.