(transitive, intransitive) To speak unintelligibly or inaudibly; to fail to articulate. / To chew something gently with closed lips.

A quiet or unintelligible vocalization; a low tone of voice.

simple past tense and past participle of mumble

plural of mumble

A coastal suburb, a community and headland (Mumbles Head) in the City and County of Swansea, Wales (OS grid ref ST6188).

present participle of mumble

An act in which someone mumbles something

Prone to mumbling.

plural of mumbling

(obsolete, religious slur) A Roman Catholic priest.