[医] 嗫语

[ noun ]
a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech
<noun.event>

Mussitation \Mus`si*ta"tion\, n. [L. mussitatio suppression of
the voice, fr. mussitare to be silent, to murmur.]
A speaking in a low tone; mumbling. [Obs.]