Source : Webster's Revised Unabridged Dictionary (1913)

Enervate \E*ner"vate\, v. t. [imp. & p. p. {Enervated}; p. pr. &
   vb. n. {Enervating}.] [L. enervatus, p. p. of enervare, fr.
   enervis nerveless, weak; e out + nervus nerve. See {Nerve}.]
   To deprive of nerve, force, strength, or courage; to render
   feeble or impotent; to make effeminate; to impair the moral
   powers of.

         A man . . . enervated by licentiousness. --Macaulay.

         And rhyme began t' enervate poetry.      --Dryden.

   Syn: To weaken; enfeeble; unnerve; debilitate.

Source : WordNet®

enervated
     adj : lacking strength or vigor [syn: {adynamic}, {asthenic}, {debilitated}]