UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈmʌmbəl/US:USA pronunciation: IPA and respellingUSA pronunciation: IPA/ˈmʌmbəl/ ,USA pronunciation: respelling(mum′bəl)
mutterCollocations, murmur, speak indistinctly, speak inarticulately, speak in a low voice, say sth in a low voice, say sth sotto voce, say sth indistinctly, say sth in a murmur, mutter sth under your breath, say sth in an undertone, utterCollocations, mouthCollocations, whisperCollocations, say sth in a whisper
Antonyms:
enunciate, articulateCollocations, speak clearly, talk clearly, speak up