chunter

Verb

Verb Forms: chuntered, chuntering, chunters

To grumble or mutter in a low, indistinct voice.
To speak in a soft, indistinct manner, mutter.
To grumble, complain.

Examples

He would often CHUNTER to himself while trying to unscramble his Scrabble tiles.

Scrabble Score: 12

chunter: valid Scrabble (US) TWL Word
chunter: valid Scrabble Word in Merriam-Webster MW Dictionary
chunter: valid Scrabble Word in International Collins CSW Dictionary

Words With Friends Score: 14

chunter: valid Words With Friends Word