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. 2 showing more confidence that something will be successful than is justified by later events The sales forecasts turned out to be overoptimistic.