Symptomatic :: Symptom (n.) A sign or token; that which indicates the existence of something else; as, corruption in elections is a symptom of the decay of public virtue..
Symptomatical :: Symptomatical (a.) Of or pertaining to symptoms; happening in concurrence with something; being a symptom; indicating the existence of something else.
Symptomatology :: Symptomatical (a.) According to symptoms; as, a symptomatical classification of diseases..