A more thorough explanation:

mutus et surdus

Someone who is unable to hear or speak is called mutus et surdus. This term comes from Latin and is used to describe people who are deaf and dumb.

• John is mutus et surdus, so he communicates using sign language.
• Maria is a teacher who works with mutus et surdus students.

The examples show how mutus et surdus is used to describe people who have a hearing and speech impairment. John is unable to hear or speak, so he uses sign language to communicate. Maria is a teacher who works with students who are deaf and dumb.