Mumble
/mˈʌmbəl/
Listen pronunciation
Definition
(verb) To speak unintelligibly or inaudibly; to fail to articulate.
Sentence Examples
I heard him mumble to himself.
Don't mumble your words. You are too old for that.
CEFR Practice Quiz
Please do not ____ your words when you are speaking to the entire class it is very important that everyone can hear you clearly.