https://www.merriam-webster.com/thesaurus/mutterers
MUTTERERS Synonyms: 39 Similar and Opposite Words | Merriam-Webster Thesaurus
Synonyms for MUTTERERS: crabs, bears, complainers, cranks, hunks, murmurers, bellyachers, fussers; Antonyms of MUTTERERS: optimists, Pollyannas, happy campers
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