Low tone
Mutter and low tone are semantically related. in suggestion topic. In some cases you can use "Mutter" instead a noun phrase "Low tone".
Mutter
Mutter noun - Speech that is not clear enough to be understood.
Mutual synonyms
Cite this Source
Mutter and Low tone. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/low_tone/mutter
Low tone & Mutter. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/low_tone/mutter>.
Mutter or Low tone. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/low_tone/mutter.
Google Ngram Viewer shows how "low tone" and "mutter" have occurred on timeline