dysdiadochokinesia
noun
dys·di·ad·o·cho·ki·ne·sia
variants:
or dysdiadokokinesia \ ˌdis-ˌdī-ˌad-ə-ˌkō-kī-ˈnē-zh(ē-)ə 
\
\
Medical Definition of dysdiadochokinesia
: impairment of the ability to make movements exhibiting a rapid change of motion that is caused by cerebellar dysfunction — compare adiadokokinesis