Dumb
Definition 1 of 4
Pro Tip 1/2
Literal Silence
Originally meant unable to speak, used for physical inability to vocalize. In the past, people who were deaf were often called dumb too.
Pro Tip 2/2
Sensitive Usage
Be careful using 'dumb' to describe non-speaking; it may be offensive. Instead of 'dumb', it's more respectful to say 'non-verbal'.