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Pronunciation of 

optimistic

view main entry for optimisticadjective  /ˌɒptɪˈmɪstɪk/
British English pronunciation: optimisticClick to listen to the pronunciation of optimistic

derived word

optimistically

  /ˌɒptɪˈmɪstɪkli/  adverb
British English pronunciation: optimisticallyClick to listen to the pronunciation of optimistically

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