[v. en-er-veyt; adj. ih-nur-vit]
verb (used with object), enervated, enervating.
to deprive of force or strength; destroy the vigor of; weaken. enfeeble, debilitate, sap, exhaust.

1595–1605; < Latin ēnervātus weakened (past participle of ēnervāre) equivalent to ē- e-1 + nerv(us) sinew (see nerve) + -ātus -ate1; compare Anglo-French enervir, French énerver

enervation, noun
enervative, adjective
enervator, noun
nonenervating, adjective

energize, enervate, innervate, invigorate.
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World English Dictionary
1.  (tr) to deprive of strength or vitality; weaken physically or mentally; debilitate
2.  deprived of strength or vitality; weakened
[C17: from Latin ēnervāre to remove the nerves from, from nervus nerve, sinew]

enervating (ˈɛnəˌveɪtɪŋ)
tending to deprive of strength or vitality; physically or mentally weakening; debilitating

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

c.1600, from L. enervat-, pp. stem of enervare (see enervation). Related: Ennervated; ennervating.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

enervate en·er·vate (ěn'ər-vāt')
v. en·er·vat·ed, en·er·vat·ing, en·er·vates

  1. To remove a nerve or nerve part.

  2. To cause weakness or a reduction of strength.

en'er·va'tion n.
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
Instead of enervating him, those moments seemed to energize him.
There are those spasms of silence which are rather enervating, and then there are times when the voices are somewhat stentorian.
The purpose of the proposed injection was to block the nerves enervating the anomalous joint.
It poured rain, but no one cared, for the river and the rain were the only relief from the enervating heat.
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