Source : Webster's Revised Unabridged Dictionary (1913)

Symptomatic \Symp`tom*at"ic\, Symptomatical \Symp`tom*at"ic*al\,
   a. [Cf. F. symptomatique, Gr. ? causal.]
   1. Of or pertaining to symptoms; happening in concurrence
      with something; being a symptom; indicating the existence
      of something else.

            Symptomatic of a shallow understanding and an
            unamiable temper.                     --Macaulay.

   2. According to symptoms; as, a symptomatical classification
      of diseases. -- {Symp`tom*at"ic*al*ly}, adv.

Source : WordNet®

symptomatically
     adv : by symptoms