The Collaborative International Dictionary of English v.0.48:

Diseased \Dis*eased"\, a.
   Afflicted with disease.
   [1913 Webster]

         It is my own diseased imagination that torments me.
                                                  --W. Irving.

   Syn: See Morbid.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Disease \Dis*ease"\, v. t. [imp. & p. p. Diseased; p. pr. &
   vb. n. Diseasing.]
   1. To deprive of ease; to disquiet; to trouble; to distress.
      [Obs.]
      [1913 Webster]

            His double burden did him sore disease. --Spenser.
      [1913 Webster]

   2. To derange the vital functions of; to afflict with disease
      or sickness; to disorder; -- used almost exclusively in
      the participle diseased.
      [1913 Webster]

            He was diseased in body and mind.     --Macaulay.
      [1913 Webster]

WordNet (r) 3.0 (2006):

diseased
    adj 1: caused by or altered by or manifesting disease or
           pathology; "diseased tonsils"; "a morbid growth";
           "pathologic tissue"; "pathological bodily processes"
           [syn: diseased, morbid, pathologic, pathological]

Moby Thesaurus II by Grady Ward, 1.0:

28 Moby Thesaurus words for "diseased":
   abed, abnormal, afflicted, ailing, bad, cankered, contaminated,
   gangrened, gangrenous, ill, infected, infirm, morbid, mortified,
   out of sorts, pathological, peccant, poisoned, septic, sick,
   sphacelated, tainted, ulcerated, ulcerous, unhealthy, unsound,
   unwell, unwholesome