mutter - Wiktionary
A repressed or obscure utterance; an instance of muttering. The prisoners were docile, and accepted their lot with barely a mutter.··To utter words, especially complaints or angry expressions, indistinctly or with a low voice and lips partly closed; to say under one's breath. You could hear the students mutter as they were served sodden spaghetti, yet ...
DA: 49 PA: 98 MOZ Rank: 9