1. people who speak in a low, unclear way that is difficult to understand
Usage: plural of mumbler

Examples

• The teacher asked the mumblers in the back row to speak more clearly.
• During the presentation, several mumblers made it hard for the audience to follow along.
• The coach told the mumblers on the team to project their voices during practice.
• At the meeting, the mumblers were asked to repeat their comments.
• The drama teacher worked with the mumblers to improve their diction.
• Some mumblers don’t realize how difficult they are to understand.