brain-dead Meaning in the Cambridge English Dictionary
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Meaning of “brain-dead” in the English Dictionary

"brain-dead" in British English

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uk   us   /ˈbreɪn.ded/
If someone is brain-dead, they have ​serious and ​permanentdamage to ​theirbrain, and need ​machines in ​order to ​stayalive. humorous If someone is brain-dead, ​theirmind is not ​workingeffectively, usually because they are very ​tired or very ​bored: By the ​time I ​leavework I'm ​completely brain-dead.
(Definition of brain-dead from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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