English

Definition of hyperactive adjective from the Oxford Advanced Learner's Dictionary

 

hyperactive

 adjective
adjective
BrE BrE//ˌhaɪpərˈæktɪv//
 
; NAmE NAmE//ˌhaɪpərˈæktɪv//
 
 
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(especially of children and their behaviour) too active and only able to keep quiet and still for short periods Word Origin mid 19th cent.: from hyper- + active.
See the Oxford Advanced American Dictionary entry: hyperactive