1. the quality or state of being unable to speak
Usage: often used in medical or formal contexts
2. the quality or state of being stupid or lacking intelligence
Usage: informal; can be considered offensive when applied to people

Examples

• The character's dumbness in the film was portrayed through exaggerated physical comedy.
• His dumbness on the test surprised no one given how little he studied.
• The dumbness of the decision became apparent only after the consequences unfolded.
• She was struck dumb by shock, but her dumbness was temporary.
• The dumbness of repeating the same mistake frustrated everyone involved.