mussitate \ MUHS-i-teyt \ , verb;

[writinggame]

http://dictionary.reference.com/wordoftheday/archive/2010/10/02.html

1. To silently move the lips in simulation of audible speech.

Quotes:
"Oh, Anu, I never thought to see you again," he mussitates . (I have appeared to him in my original form.)
-- Dan Wick, The Devil's Tale

Origin:
Mussitate comes from the Latin mussitāre , "speak indistinctly." Mutter shares the same roots.