U

enervation

verb (used with object), en·er·vat·ed, en·er·vat·ing.

to deprive of force or strength; destroy the vigor of; weaken.

adjective

enervated.

verb (ˈɛnəˌveɪt)

(tr) to deprive of strength or vitality; weaken physically or mentally; debilitate

adjective (ɪˈnɜːvɪt)

deprived of strength or vitality; weakened

early 15c., from Middle French énervation, from Late Latin enervationem (nominative enervatio), noun of action from past participle stem of Latin enervare “weaken,” literally “cut the sinews of,” from ex- “out” (see ex-) + nervus “sinew” (see nerve). Figurative sense is from 1550s.

c.1600, from Latin enervatus, past participle of enervare “to weaken” (see enervation). Related: Ennervated; ennervating.

To remove a nerve or nerve part.
To cause weakness or a reduction of strength.