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Definition of optimistic adjective from the Oxford Advanced American Dictionary

 

optimistic

 adjective
adjective
NAmE//ˌɑptəˈmɪstɪk//
 
 
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expecting good things to happen or something to be successful; showing this feeling synonym positive optimistic (about something) She's not very optimistic about the outcome of the talks. optimistic (that…) They are cautiously optimistic that the reforms will take place. We are now taking a more optimistic view. in an optimistic mood I think you're being overly optimistic. opposite pessimistic
optimistically
 
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NAmE//ˌɑptəˈmɪstɪkli//
 
adverb He spoke optimistically about better relations between the two countries.
See optimistic in the Oxford Advanced Learner's Dictionary