What is Deaf ?
Deaf is (adj) not able to hear, or having difficulty in hearing My grandma is going deaf. He’s deafer than he used to be. (NOTE: Some people avoid this term as it can cause offence and prefer hearing-impaired.) to be stone deaf to be completely deaf to turn a deaf ear to something not to agree to what someone is asking for (noun) the deaf people who cannot hear Their son goes to a school for the deaf.
source: Easier English, Student Dictionary Upper Intermediate Level