mumbling in a sentence

Definition

Mumbling is the act of speaking quietly and indistinctly, often in a way that is difficult to hear or understand.

She was mumbling under her breath, clearly frustrated with the situation.
The child was mumbling the lyrics to his favorite song, lost in his own world.
During the meeting, he kept mumbling his thoughts, making it hard for anyone to hear him.
I could barely understand her, as she was mumbling softly in the corner of the room.
Mumbling to himself, he paced back and forth, trying to find a solution to the problem.