enervate
Concise Oxford English Dictionary © 2008 Oxford University Press:
enervate /ˈɛnəveɪt/
▶verb cause to feel drained of energy.
– derivatives
enervation noun.
enervation noun.
– origin C17 (earlier (ME) as enervation): from L. enervat-, enervare ‘weaken (by extraction of the sinews)’.
'enervate' also found in these Oxford entries:

