To mumble is to talk quietly and indistinctly. When people speak in a mumble, it's hard to understand them.

Mumbling is a way of speaking that’s a little like whispering. Like whispering, mumbling is usually done with a low voice. However, mumbling is harder to understand than a whisper. When we mumble, we don't form out words clearly. Mumbling is the opposite of speaking clearly. Some people mumble because they lack confidence. Others might mumble because they're tired or not feeling well. If you want to be a good public speaker, you'd better learn to not mumble.

Definitions of mumble

v talk indistinctly; usually in a low voice

maunder, mussitate, mutter
Type of:
mouth, speak, talk, utter, verbalise, verbalize
express in speech

v grind with the gums; chew without teeth and with great difficulty

“the old man had no teeth left and mumbled his food”
Type of:
chew, jaw, manducate, masticate
chew (food); to bite and grind with the teeth

n a soft indistinct utterance

Type of:
utterance, vocalization
the use of uttered sounds for auditory communication

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