op·ti·mism 
/ˈɑ:ptəˌmɪzəm/ noun
/ˈɑ:ptəˌmɪzəm/ noun [noncount] : a feeling or belief that good things will happen in the future : a feeling or belief that what you hope for will happen
▪ Both of them expressed optimism about the future of the town. ▪ The early sales reports are cause/reason/grounds for optimism. ▪ Most of us reacted to the news with cautious/guarded optimism. [=a feeling that something good may happen but will not definitely happen] ▪ There is growing optimism that the problem can be corrected. ▪ He maintains a sense of optimism, despite all that has happened. — opposite pessimism
▪ Both of them expressed optimism about the future of the town. ▪ The early sales reports are cause/reason/grounds for optimism. ▪ Most of us reacted to the news with cautious/guarded optimism. [=a feeling that something good may happen but will not definitely happen] ▪ There is growing optimism that the problem can be corrected. ▪ He maintains a sense of optimism, despite all that has happened. — opposite pessimism
