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Related to Mutteringly: grumbly


adv.1.With a low voice and indistinct articulation; in a muttering manner.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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In a humorous aside, the story went on, "All the familiar Army phrases which are mutteringly directed at the bugler when it's time to get up will have to be changed now.
Sbaraglia's decision to keep things mutteringly low-key starts to grate.