What is the meaning of deaf?

noun

• People who have severe hearing impairments.
  • usage: "many of the deaf use sign language"

verb

• Make or render deaf.
  • usage: "a deafening noise"
  • synonyms: deafen

adjective

• Lacking or deprived of the sense of hearing wholly or in part.
• Usually followed by `to'. ( unwilling or refusing to pay heed)
  • usage: "deaf to her warnings"
  • synonyms: indifferent