Akinetic

Without movement (or without much movement).

A term used in neurology to denote the absence (or poverty) of movement.

The word 'akinetic' comes from the prefix 'a-' meaning 'without' + the Greek word 'kinesis' meaning motion = without motion.

For example, a person in coma is akinetic.

For another example, akinetic mutism is a condition in which a person is both mute and akinetic.

A textbook on clinical neurology observes that a person with akinetic mutism has 'sleep-waking cycles but, when apparently awake, with eyes open, lies mute.

Immobile and unresponsive.'