verb (used with object), debilitated, debilitating.
to make weak or feeble; enfeeble: The siege of pneumonia debilitated her completely.

1525–35; < Latin dēbilitātus (past participle of dēbilitāre), equivalent to dēbilit-, stem of dēbilis weak + -ātus -ate1

debilitant, noun
debilitation, noun
debilitative, adjective
nondebilitating, adjective
nondebilitation, noun
nondebilitative, adjective
overdebilitate, verb (used with object), overdebilitated, overdebilitating.
undebilitated, adjective
undebilitating, adjective
undebilitative, adjective

weaken, deplete, enervate, devitalize. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
debilitate (dɪˈbɪlɪˌteɪt)
(tr) to make feeble; weaken
[C16: from Latin dēbilitāre, from dēbilis weak]

debilitating (dɪˈbɪlɪˌteɪtɪŋ)
tending to weaken or enfeeble

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

1530s, from L. debilitat-, pp. stem of debilitare "to weaken," from debilis "weak" (see debility). Related: Debilitated (1610s).

1670s, pp. adj. from debilitate (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

debilitating de·bil·i·tat·ing (dĭ-bĭl'ĭ-tā'tĭng)
Causing a loss of strength or energy.

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
The book spans Marley's life from puppyhood to debilitating old age.
The author argues that even the debilitating processes of aging help us realize
  our destinies.
That's a debilitating problem for a player whose game is based on speed, both
  as a receiver and a punt returner.
Here are a few additional, but relatively lower impact ideas to also help
  battle this debilitating prognosis.
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