optimism
noun [ U ]
uk/ˈɒptɪmɪzəm/ usthe feeling that good things are more likely to happen than bad things:
optimism about/over sth There was a wave of optimism about future earnings of software and internet companies.
Some analysts expressed cautious optimism that this could be a turning point.
consumer/investor/public optimism
reason/cause for optimism
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pessimism