hy·per·ac·tive

[hahy-per-ak-tiv]
adjective
1.
unusually or abnormally active: a company's hyperactive growth; the child's hyperactive imagination.
2.
(of children) displaying exaggerated physical activity sometimes associated with neurologic or psychologic causes.

Origin:
1865–70; hyper- + active

hy·per·ac·tion [hahy-per-ak-shuhn] , noun
hy·per·ac·tive·ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
hyperactive (ˌhaɪpərˈæktɪv) [Click for IPA pronunciation guide]
 
adj
abnormally active
 
hyper'action
 
n
 
hyperac'tivity
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Hyperactive is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
American Heritage
Medical Dictionary

hyperactive hy·per·ac·tive (hī'pər-āk'tĭv)
adj.

  1. Highly or excessively active, as a gland.

  2. Having behavior characterized by constant overactivity.

  3. Afflicted with attention deficit disorder.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
They tend to be hyperactive and are often boisterous at inappropriate moments.
Hyperactive behavior usually refers to a group of characteristics.
Even those boys described as hyperactive by their teachers showed no adverse
  effects from the sugary meal, which was consumed.
One shrubby perennial is so popular with these hyperactive birds, it's commonly
  called hummingbird trumpet.
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