1. speech that is low and unclear, difficult to understand

1. speaking in a low, unclear way that is difficult to understand
Usage: present participle of mumble

Examples

• Stop mumbling and speak clearly so I can understand you.
• The student was mumbling the answers under his breath.
• Her mumbling made it impossible to hear what she was saying.
• The old man’s constant mumbling annoyed the other passengers.
• I could hear mumbling from the next room but couldn’t make out the words.
• His mumbling during the presentation lost the audience’s attention.