To mumble words indistinctly or in a low tone, often as if talking to oneself.
She was caught muttering under her breath during the meeting.
Muttering to oneself is a complex vocal tic
After the fight with her boyfriend, Olivia was left muttering arguments and comments under her breath.
speaking indistinctly and complainingly
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Somniloquent refers to talking in one's sleep or speaking while asleep. It is a type of sleep disorder that involves speech during the stages of sleep.
Uttering, muttering, fluttering, cluttering, and sputtering.
The muttering was illegible.Nobody could decipher the illegible scribbles.
The crew has been muttering about mutiny, sir.
"Muttering retreats"
Mutter is a noun and a verb.
He responded to our attempt to get him out of bed with several minutes of incoherent muttering.