OVEROPTIMISTIC Meaning of OVEROPTIMISTIC in English overoptimistic BrE AmE ˌəʊv ə r ˌɒpt ɪ ˈmɪst ɪk ◂ -ˌ•ə- AmE \ ˌoʊv ə r ˌɑːpt-▷ overoptimistic|ally ə l‿i Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012