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English definition of “optimism”

optimism

noun [U]    /ˈɑp·təˌmɪz·əm/
the tendency to be hopeful and to emphasize or think of the good part in a situation rather than the bad part, or the feeling that in the future good things are more likely to happen than bad things: There was a note of optimism in his voice as he spoke about his recovery. optimist    /ˈɑp·tə·mɪst/ noun [C] She was an optimist in the face of adversity. optimistic    /ˌɑp·təˈmɪs·tɪk/ adjective I’m optimistic that they can work things out. optimistically    /ˌɑp·təˈmɪs·tɪ·kli/ adverb White optimistically predicted success.
(Definition of optimism noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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