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deaf  (deafer comparative) (deafest superlative )
1  adj Someone who is deaf is unable to hear anything or is unable to hear very well. 
She is now profoundly deaf.  
  The deaf are people who are deaf., n-plural the N 
 deafness  n-uncount 
Because of her deafness she was hard to make conversation with.  
2  adj If you say that someone is deaf to people's requests, arguments, or criticisms, you are criticizing them because they refuse to pay attention to them., (disapproval)   (=impervious) 
The provincial assembly were deaf to all pleas for financial help.  
3 
  to fall on deaf ears 
  ear 
  to turn a deaf ear 
  ear