Definition of brain-dead adjective from the Oxford Advanced American Dictionary

     

    brain-dead

     adjective
    adjective
     
     
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  1. 1suffering from serious damage to the brain and needing machines to stay alive Doctors declared her clinically brain-dead.
  2. 2(humorous) very stupid and boring; not intelligent I was afraid of becoming brain-dead after months at home.
See the Oxford Advanced Learner's Dictionary entry: brain-dead