C2 the quality of being full of hope and emphasizing the good parts of a situation, or a belief that something good will happen乐观;乐观主义
More examples
In spite of the scale of the famine, the relief workers struggled on with dauntless optimism and commitment.
Her optimism seemed to infect all those around her.
The prevailing mood is one of optimism.
The prime minister's speech was intended to purvey a message of optimism.
International support has given rise to a new optimism in the company.
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