Lacking the power of speech, often due to a physical condition. adjective
The dumb child communicated through sign language.
In the past, people who were unable to speak were often referred to as dumb.
Temporarily unable or unwilling to speak. adjective
She was struck dumb with amazement.
He stood dumb as the news was announced.
Lacking intelligence or good judgment; stupid. adjective
It was a dumb mistake to leave the keys in the car.
He's not dumb, he just didn't understand the question.
To make silent or mute. verb
The loud noise dumbed the crowd momentarily.
The shocking revelation dumbed the audience.