brain-dead

/ˈbɹeɪnˌdɛd/

adjective

Having an irreversible loss of brain function and cessation of brain activity.

Meanings

adjectivebrain-dead (comparative more brain-dead, superlative most brain-dead)

comparative more brain-dead · superlative most brain-dead · alternative brain dead · alternative braindead

  1. not comparablemedicineHaving an irreversible loss of brain function and cessation of brain activity.

    An employee of the mayor's office was declared brain-dead on Sunday morning after she and another woman were struck by a hit-and-run driver while crossing Flatbush Avenue in Brooklyn, the authorities said.

    2010 February 22, Michael S. Schmidt, Karen Zraick, “Hit and Run in Brooklyn Leaves One Brain-Dead”, in The New York Times, →ISSN
  2. colloquialderogatoryHaving no useful thoughts; stupid; ditzy.

    "AI has been brain-dead since the 1970s," said AI guru Marvin Minsky in a recent speech at Boston University. Minsky co-founded the MIT Artificial Intelligence Laboratory in 1959 with John McCarthy.

    2003 May 13, Mark Baard, quoting Marvin Minsky, “AI Founder Blasts Modern Research”, in Wired, →ISSN
nounbrain-dead (plural brain-deads)

plural brain-deads · alternative brain dead · alternative braindead

  1. derogatoryinformalAn unintelligent person.

    "What makes you different from all the other brain-deads that come through here?"

    2015 October 6, Sarah J. Schmitt, It's a Wonderful Death, Simon and Schuster, →ISBN

Origin

From brain + dead. Coined by the Harvard physician Henry K. Beecher in the historical context of the Sixties counterculture and life extension technology of the late twentieth century.

Full word history & related roots →

Translations

Afrikaans breindood
  • breindoodin medicine: having irreversible cessation of brain activity
Chinese Mandarin 脑残
  • 脑残 (nǎocán)colloquially: having no useful thoughts
Danish hjernedød, hjernedød
  • hjernedødin medicine: having irreversible cessation of brain activity
  • hjernedødcolloquially: having no useful thoughts
  • åndssvagcolloquially: having no useful thoughts
Dutch hersendood
  • hersendoodin medicine: having irreversible cessation of brain activity
Finnish aivokuollut, aivoton
  • aivokuollutin medicine: having irreversible cessation of brain activity
  • aivotoncolloquially: having no useful thoughts
  • järjetöncolloquially: having no useful thoughts
  • älyvapaacolloquially: having no useful thoughts
French en état de mort cérébrale
  • en état de mort cérébralein medicine: having irreversible cessation of brain activity
German hirntot
  • hirntotin medicine: having irreversible cessation of brain activity
Hungarian agyhalott
  • agyhalottin medicine: having irreversible cessation of brain activity
Italian cerebroleso, testa vuota
  • cerebrolesocolloquially: having no useful thoughts
  • testa vuotacolloquially: having no useful thoughts
Norwegian Bokmål hjernedød, hjernedød
  • hjernedødin medicine: having irreversible cessation of brain activity
  • hjernedødcolloquially: having no useful thoughts
Polish w stanie śmierci mózgu
  • w stanie śmierci mózguin medicine: having irreversible cessation of brain activity
Portuguese com morte cerebral, cerebralmente morto
  • com morte cerebralin medicine: having irreversible cessation of brain activity
  • cerebralmente mortoin medicine: having irreversible cessation of brain activity
  • descerebradocolloquially: having no useful thoughts
Spanish muerto cerebral, muerto cerebral
  • muerto cerebralin medicine: having irreversible cessation of brain activity
  • muerto cerebralcolloquially: having no useful thoughts
  • descerebradocolloquially: having no useful thoughts
Swedish hjärndöd, hjärndöd
  • hjärndödin medicine: having irreversible cessation of brain activity
  • hjärndödcolloquially: having no useful thoughts
Turkish beyni ölü, beyni ölmüş
  • beyni ölüin medicine: having irreversible cessation of brain activity
  • beyni ölmüşin medicine: having irreversible cessation of brain activity
  • beyinsizcolloquially: having no useful thoughts
Cite this entry
APA

brain-dead. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/brain-dead

MLA

“brain-dead.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/brain-dead. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “brain-dead,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/brain-dead.

Source: brain-dead on Wiktionary, CC BY-SA 4.0.