[hahy-per-ki-nee-zhuh, -zhee-uh, -zee-uh, -kahy-]
Pathology. an abnormal amount of uncontrolled muscular action; spasm.
Psychiatry. a disorder occurring in children and adolescents, characterized by excessive activity, extreme restlessness, impulsivity, and a short attention span.
Also, hyperkinesis [hahy-per-ki-nee-sis, -kahy-] .

1840–50; hyper- + -kinesia

hyperkinetic [hahy-per-ki-net-ik, -kahy-] , adjective
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World English Dictionary
hyperkinesia or hyperkinesis (ˌhaɪpəkɪˈniːzɪə, -kaɪ-, ˌhaɪpəkɪˈniːsɪs, -kaɪ-)
1.  excessive movement, as in a muscle spasm
2.  extreme overactivity in children
[C20: from hyper- + -kinesia from Greek kinēsis movement, from kinein to move]
hyperkinesis or hyperkinesis
[C20: from hyper- + -kinesia from Greek kinēsis movement, from kinein to move]
hyperkinetic or hyperkinesis

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American Heritage
Medical Dictionary

hyperkinesia hy·per·ki·ne·sia (hī'pər-kə-nē'zhə, -kī-) or hy·per·ki·ne·sis (-sĭs)
Pathologically increased muscular movement.

hy'per·ki·net'ic (-nět'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
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Example sentences
It's a nifty effect, but it barely hints at what the technology might do in the hands of a hyperkinetic developer.
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