To mumble words indistinctly or in a low tone, often as if talking to oneself.
I could not understand what it was that you were muttering about.
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.
Muttering is not typically considered onomatopoeia. Onomatopoeia refers to words that phonetically imitate or resemble the sound they describe, such as "buzz" or "hiss." While muttering suggests a low, indistinct sound, it doesn't mimic a specific noise in the same way that onomatopoeic words do. Instead, it describes a manner of speaking rather than a sound itself.
Uttering, muttering, fluttering, cluttering, and sputtering.
The crew has been muttering about mutiny, sir.
The muttering was illegible.Nobody could decipher the illegible scribbles.
"Muttering retreats"
Mutter is a noun and a verb.