enervate
verb (formal)- enervate somebody
to make somebody feel weak and tired 使感到衰弱（或虚弱、无力） an enervating disease/climate 使人衰弱的疾病；使人感到乏力的气候
Word Originearly 17th cent.: from Latin enervat- ‘weakened (by extraction of the sinews)’, from the verb enervare, from e- (variant of ex-) ‘out of’ + nervus ‘sinew’.