The Collaborative International Dictionary
enervating
enervating \enervating\ adj. causing the loss of strength or vigor.
Syn: debilitative, enfeebling, weakening.
Wiktionary
enervating
vb. (present participle of enervate English)
WordNet
enervating
adj. causing debilitation [syn: debilitative, enfeebling, weakening]
Usage examples of "enervating".
The causes are tight lacing, prolapse of the abdominal organs, weakness of the supporting ligaments, and enervating habits.
In the latter case, and when only occurring at long intervals, the emissions are not followed by any perceptible enervating or weakening effects.
Galen down to the present day, about the pernicious influence of this enervating indulgence, and its strong propensity to generate the very worst and most formidable kinds of insanity.