verb (v)

• be unbearably loud(verb.perception)

  Example:
  A deafening noise.
  

  source: wordnet30
• make or render deaf(verb.perception)

  Example:
  A deafening noise.
  

  Synonym:
  deaf
  

  source: wordnet30
• make soundproof(verb.change)

  Example:
  Deafen a room.
  

  source: wordnet30
• To make deaf; to deprive of the power of hearing; to render incapable of perceiving sounds distinctly.(verb)

  source: webster1913