What term refers to a state of reduced or absent movement?

The term that refers to a state of reduced or absent movement is akinesia. Akinesia is typically used in the context of movement disorders, especially in conditions such as Parkinson's disease, where individuals exhibit difficulty in initiating movements. It is characterized by the loss of voluntary muscle movement, which can significantly impact a person's daily activities and quality of life.

The other terms, while related to movement and physical conditions, do not specifically denote a state of reduced or absent movement. Hyperactivity indicates an excess of movement or activity, which is the opposite of what is described. An aneurysm refers to an abnormal bulge in a blood vessel and is unrelated to movement. Atrophy describes the wasting away or decrease in size of muscle or tissue but does not specifically convey a reduction in the ability to move. Therefore, akinesia is the correct choice for a state of reduced or absent movement.