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Definition of overoptimistic adjective from the Oxford Advanced American Dictionary

     

    overoptimistic

     adjective
    adjective
    NAmE//ˌoʊvərˌɑptəˈmɪstɪk//
     
     
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  1. 1too confident that something will be successful I'm not overoptimistic about my chances of getting the job.
  2. 2showing more confidence that something will be successful than is justified by later events The sales forecasts turned out to be overoptimistic.