[kom-uh-tohs, koh-muh-]
affected with or characterized by coma.
lacking alertness or energy; torpid: comatose from lack of sleep.

1745–55; < Greek komat- (stem of kôma coma1) + -ose1

comatosely, adverb
comatoseness, comatosity [kom-uh-tos-i-tee] , noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
comatose (ˈkəʊməˌtəʊs, -ˌtəʊz)
1.  in a state of coma
2.  torpid; lethargic

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1755, from coma (from Gk. koma, comb. form komat-) + -ose. Transf. sense of "lethargic" is from 1828.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

comatose co·ma·tose (kō'mə-tōs', kŏm'ə-)

  1. Of, relating to, or affected with coma.

  2. Marked by lethargy; torpid.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Diplomacy is indeed comatose at present, but the leaks do not suggest it is
  past praying for.
Even comatose people continue to breathe and live for years.
Many were found comatose or suffering from seizures or muscle tremors,
  scientists said.
Many seriously ill or comatose people can survive without a respirator.
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