The Collaborative International Dictionary of English v.0.48:

Incapacitate \In`ca*pac"i*tate\, v. t. [imp. & p. p.
   Incapacitated; p. pr. & vb. n. Incapacitating.] [Pref.
   in- not + capacitate.]
   [1913 Webster]
   1. To deprive of capacity or natural power; to disable; to
      render incapable or unfit; to disqualify; as, his age
      incapacitated him for war.
      [1913 Webster]

   2. (Law) To deprive of legal or constitutional requisites, or
      of ability or competency for the performance of certain
      civil acts; to disqualify.
      [1913 Webster]

            It absolutely incapacitated them from holding rank,
            office, function, or property.        --Milman.
      [1913 Webster]

WordNet (r) 3.0 (2006):

incapacitated
    adj 1: lacking in or deprived of strength or power; "lying ill
           and helpless"; "helpless with laughter" [syn: helpless,
           incapacitated]

Moby Thesaurus II by Grady Ward, 1.0:

40 Moby Thesaurus words for "incapacitated":
   ausgespielt, bad, burned-out, castrated, crippled, devitalized,
   disabled, disarmed, disqualified, drained, effete, emasculated,
   enervated, enfeebled, eviscerated, exhausted, fatigued, game, halt,
   halting, hamstrung, handicapped, hobbling, hog-tied, invalidated,
   lame, limping, maimed, paralyzed, played out, prostrate, run-down,
   sapped, spavined, spent, used up, wasted, weakened, worn,
   worn-out