idiopathic
Id`i*o*path"ic, Id`i*o*path"ic*al, a. Etym: [Cf. F. idiopathique.] (Med.) Defn: Pertaining to idiopathy; characterizing a disease arising primarily, and not in consequence of some other disease or injury; -- opposed to symptomatic, sympathetic, and traumatic. -- Id`i*o*path"ic*al*ly, adv.