Hyperactivity

Part of speech: noun

Definitions

1. An excessive state of movement and energy that results in impulsive behavior and trouble paying attention
2. A condition marked by high levels of activity that often leads to difficulties in concentrating and controlling impulses
3. A state characterized by unusually high energy and difficulty maintaining focus or self-control

Etymology: Hyperactivity is a transparent compound: the prefix "hyper-", from Ancient Greek "hupér" meaning "over" or "beyond", attached to "activity." The Greek prefix passed into English as a scientific and technical element, so the word combines a classical prefix with a Latin-derived noun. The noun "activity" traces back through Middle French "activité" to Latin "āctīvitās," formed from "āctīvus" ("active"), itself from Latin "agere," "to drive, do, act." Its ancestry runs to Ancient Greek "energētikós," which shows that the same idea of effective doing was already present in Greek before Latin took it up. Hyperactivity is a relatively modern formation. It is built from parts that were well established in English, so its meaning is simply "activity in excess," which is exactly what the word says.

Synonyms: overactivity, excessive activity, restlessness

Antonyms: calmness, tranquility, stillness