n. Quality of being hyperactive; excessive and pathological movement and restlessness
the GNU version of the Collaborative International Dictionary of English
n. an unusually high level of activity; -- used especially with respect to children who move around frequently and do not sit still very long, most noticeably in school. It is sometimes associated with attention deficit disorder.
The Century Dictionary and Cyclopedia
n. Over-activity; excessive energy.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a condition characterized by excessive restlessness and movement
Word Usage
"NED needs his Ritalin — his hyperactivity is out of control."