IPA: /ˌoʊvərˈæktɪv/
KK: /oʊvərˈæktɪv/
Being more active than normal, often in a way that is too much or not needed.
The overactive child had trouble sitting still during class.
Overactive → It is formed from "over-" (meaning excessively or too much) and "active" (from Latin "activus", meaning to do or to act). The word "overactive" describes a state of being excessively active or having too much activity.
Think of being 'excessively' active — 'over-' means too much, and 'active' relates to doing things.