overactive

[ oh-ver-ak-tiv ]
/ ˌoʊ vərˈæk tɪv /

adjective

exceptionally or excessively active; too active.

Origin of overactive

First recorded in 1640–50; over- + active
Related formso·ver·ac·tiv·i·ty, o·ver·ac·tive·ness, noun
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Examples from the Web for overactive

British Dictionary definitions for overactive

overactive

/ (ˌəʊvərˈæktɪv) /

adjective

inordinately active
(of the thyroid or adrenal gland, nervous system, etc) functioning at too high a capacity
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012