Definition of hyperactive adjective from the Oxford Advanced American Dictionary

 

hyperactive

 adjective
adjective
NAmE//ˌhaɪpərˈæktɪv//
 
 
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(especially of children and their behavior) too active and only able to keep quiet and still for short periods
hyperactivity
 
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NAmE//ˌhaɪpərækˈtɪvət̮i//
 
noun [uncountable]
See the Oxford Advanced Learner's Dictionary entry: hyperactive