brain-dead

US /ˈbreɪn.ded/
UK /ˈbreɪn.ded/
"brain-dead" picture
1.

having no brain activity, typically as indicated by a flat encephalogram, and therefore no hope of recovery, although the heart may still be beating

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The patient was declared brain-dead after the accident.
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Organ donation is possible when a person is medically confirmed as brain-dead.
2.

extremely stupid or foolish

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That was a completely brain-dead idea.
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He gave a brain-dead response to the question.
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stupidfoolishidioticsenselessmindless
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braindeadbrain deathbrain draindead enddead heatdead loss