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See more synonyms for overactive on Thesaurus.com
  1. exceptionally or excessively active; too active.
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Origin of overactive

First recorded in 1640–50; over- + active
Related formso·ver·ac·tiv·i·ty, o·ver·ac·tive·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for overactive

excitable, high-strung, uncontrollable, wild, hyper, overactive, overzealous

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British Dictionary definitions for overactive


  1. inordinately active
  2. (of the thyroid or adrenal gland, nervous system, etc) functioning at too high a capacity
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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