deaf and dumb/deaf-mute/dumb

these offensive terms are also usually incorrect; most deaf people have functioning vocal chords although they may choose not to use them (because of the difficulty of imitating sounds never heard) and they communicate fully and expressively by means of some form of sign language. A person who does not use speech may be able to hear; individuals with speech and hearing disabilities can use other methods of expressing themselves, such as writing and sign language. Whenever possible and if you need to mention the disability, ask the involved individuals how they prefer being prescribed. Use deaf, someone who can't hear, someone who can't hear or speak, someone who can't speak. See also deaf/Deaf, people-first language.