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Definition of overactive adjective from the Oxford Advanced American Dictionary

     

    overactive

     adjective
    adjective
    NAmE//ˌoʊvərˈæktɪv//
     
    [usually before noun]
     
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  1. 1(of an organ or part of the body) causing harm by doing something too much an overactive thyroid
  2. 2(of someone's imagination) too active, especially so that they imagine things that are not true She suffers from an overactive imagination.
See overactive in the Oxford Advanced Learner's Dictionary
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