Simple Definition of overactive
: too active especially in a way that produces a bad result
Full Definition of overactive
: excessively or abnormally active <overactive glands> <an overactive imagination>
Examples of overactive in a sentence
She has an overactive bladder.
His crazy ideas are products of an overactive imagination.
First Known Use of overactive
Seen and Heard
What made you want to look up overactive? Please tell us where you read or heard it (including the quote, if possible).