IPA: //ˌhaɪpərkɪˈniːsɪs//
KK: /haɪpərkɪˈniːsɪs/
A condition, often seen in children, where there is excessive movement and activity that can be hard to control.
The doctor diagnosed him with hyperkinesis after observing his constant fidgeting and inability to sit still.
Hyperkinesis is formed from "hyper-" (meaning over or excessive) and "kinesis" (from Greek "kinesis", meaning movement). The word describes a condition characterized by excessive movement or hyperactivity.
Think of 'hyper-' meaning excessive and 'kinesis' meaning movement — this helps you remember that hyperkinesis refers to excessive movement.