exceptionally or excessively active; too active.

1640–50; over- + active

overactivity, overactiveness, noun
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World English Dictionary
overactive (ˌəʊvərˈæktɪv)
1.  inordinately active
2.  (of the thyroid or adrenal gland, nervous system, etc) functioning at too high a capacity

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Which is not to say there are no hazards from an overactive sun.
If decrepitude is driven by an overactive immune system, then it is treatable.
Strabismus, commonly known as cross-eye, is caused by an overactive eye muscle.
The result is an overactive immune response that leads to chronic inflammation.
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