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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for overactive

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

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British Dictionary definitions for overactive



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