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v. mut·tered, mut·ter·ing, mut·ters
1. To speak indistinctly in low tones.
2. To complain or grumble morosely.
To utter or say in low indistinct tones.
A low grumble or indistinct utterance.

[Middle English muttren, possibly from Latin muttīre.]

mut′ter·er n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.mutterer - a person who speaks softly and indistinctly
speaker, talker, verbaliser, verbalizer, utterer - someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous); "the speaker at commencement"; "an utterer of useful maxims"


A person who habitually complains or grumbles:
Informal: crank, griper, grouser.
References in periodicals archive ?
46, almost three minutes ahead of fourth-placed Julian Mutterer of Germany.
Contract notice: Stubaitalbahn - new mutterer bridge km 8026, track renewal km 7835-8687.
One is a mumbling mutterer, the other speaks with methodical precision.