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Adjective: enervating  'e-nu(r),vey-ting
  1. Causing debilitation
    "These graceful regrets are powerless, and on the whole they are very enervating";
    - debilitative, enfeebling, weakening
Verb: enervate  'e-nu(r),veyt
  1. Weaken mentally or morally
  2. Disturb the composure of
    - faze, unnerve, unsettle, rattle [informal]

See also: debilitating

Type of: discomfit, discompose, disconcert, untune, upset, weaken

Encyclopedia: Enervate