OPTIMIST
Meaning of OPTIMIST in English
/ ˈɒptɪmɪst; NAmE ˈɑːp-/ noun
a person who always expects good things to happen or things to be successful
OPP pessimist
Oxford Advanced Learner's English Dictionary.
Оксфордский английский словарь для изучающик язык на продвинутом уровне.
2005