Source: The Great Interpretation of Dreams (Ibn Sirin)
Muteness in a dream is corruption in religion. Whoever sees himself mute backbites people. If he is righteous, it is piety and silence from falsehood.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
A mute person indicates a heretical man. Seeing him indicates worry.
Source: Signs in the Science of Expressions (Ibn Shaheen)
Muteness is interpreted as worry. Whoever sees himself mute will be afflicted with worry.