Nggremeng

bergumam

To speak in a low, indistinct voice, often indicating dissatisfaction or doubt.

mencibir

To make a sound or expression of dissatisfaction by protruding the lips, often accompanied by mumbling.

menggerutu

To grumble or express dissatisfaction in a low, indistinct voice.

ngedumel

To complain or grumble inwardly or in a low voice, often due to annoyance or dissatisfaction.