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English definition of “brain-dead”

brain-dead

adjective     /ˈbreɪn.ded/
If someone is brain-dead, they have serious and permanent damage to their brain, and need machines in order to stay alive.Disorders of muscles and the nervous system humorous If someone is brain-dead, their mind is not working effectively, usually because they are very tired or very bored: By the time I leave work I'm completely brain-dead.Tired and making tiredBore and bored
(Definition of brain-dead adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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