noun
catatonia
kat-uh-TOH-nee-uh/ˌkætəˈtəʊniə/
A condition that severely disrupts movement and responsiveness.
The clinical report describes catatonia affecting the patient's movement and responsiveness.

Etymology
The “tone” element points to the movement-related side of this condition. The medical sense includes immobility as well as abnormal movement and behavior.
In context
You've confirmed the diagnosis of catatonia and you've actually started the treatment.
More examples
- The assessment records several signs of catatonia.
- Her catatonia involves periods of unusual stillness.
- The medical course examines different presentations of catatonia.