debilitating

from WordNet (r) 3.0 (2006)
debilitating
    adj 1: impairing the strength and vitality [ant: {invigorating}]
    
from The Collaborative International Dictionary of English v.0.48
Debilitate \De*bil"i*tate\, v. t. [imp. & p. p. {Debilitated};
   p. pr. & vb. n. {Debilitating}.] [L. debilitatus, p. p. of
   debilitare to debilitate, fr. debilis. See {Debility}.]
   To impair the strength of; to weaken; to enfeeble; as, to
   debilitate the body by intemperance.
   [1913 Webster]

         Various ails debilitate the mind.        --Jenyns.
   [1913 Webster]

         The debilitated frame of Mr. Bertram was exhausted by
         this last effort.                        --Sir W.
                                                  Scott.
   [1913 Webster]
    
from The Collaborative International Dictionary of English v.0.48
debilitating \debilitating\ adj.
   causing weakness. Opposite of {invigorating}.
   [WordNet 1.5]
    

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