›Someone who is hyperactive has more energy than is normal, gets excited easily, and cannot stay still or think about their work: Hyperactive children often have poor concentration and require very little sleep.→ See alsohyperBecoming too excited and easily upsethyperactivity
/-ækˈtɪv.ɪ.ti//-ækˈt̬ɪv.ə.t̬i/noun[U]Becoming too excited and easily upset