- 乐观主义 lèguānzhǔyì optimismThe belief or attitude that the world is more good than bad and that the future is full of hope and success
- 乐观者 lèguānzhě optimista person who is hopeful and confident about the future
- 乐观主义者 lèguānzhǔyìzhě optimista person who tends to be hopeful and confident about the future
- 不乐观 bùlèguān despondentFeeling discouraged, weary, or pessimistic about life and the world
- 乐观其成 lèguānqíchéng to look favorably on somethingTo be happy to see something succeed; to have an optimistic attitude toward the development of a project and hope for its success