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]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Her accomplishments are all the more remarkable given that she is largely
  homebound, debilitated by chronic fatigue syndrome.
His government has been distracted and debilitated by scandals.
One patient died and the other was left chronically debilitated.
Or find yourself too old and too debilitated to do much more in a day than what
  you read here.
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