Medical Dictionary

overactive

adj over·ac·tive \ˌō-və-ˈrak-tiv\

Medical Definition of OVERACTIVE

:  excessively or abnormally active <an overactive mind> <overactive glands>
over·ac·tiv·i·ty \-ˌrak-ˈtiv-ət-ē\ noun, plural over·ac·tiv·i·ties

Browse

How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears