dysautonomia

noun

dys·​au·​to·​no·​mia ˌdis-ˌȯt-ə-ˈnō-mē-ə 

: a disorder of the autonomic nervous system that causes disturbances in all or some autonomic functions and may result from the course of a disease (as diabetes) or from injury or poisoning

especially : familial dysautonomia

dysautonomic

-ˈnäm-ik 

adjective