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

late 15c., from Fr. débilitation (13c.), from L. debilitationem, noun of action from debilitare "to weaken" (see debilitate).

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
Repeated bouts of illness take their toll in anemia and debilitation.
Pain, disfigurement, and debilitation are common in the latter stages of the
Generation by generation, volume by volume, his obsession has carried him
  closer to debilitation and corruption.
Abnormal physical examination findings appeared to be related to general
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