the belief that your ideals can be achieved, often when this does not seem likely to others

She never lost her youthful idealism and campaigned for just causes all her life. 她从未丧失过年轻时的理想主义，终生都在为正义事业而奋斗。

Compare: realism (THOUGHT)

the belief in philosophy that objects in the world are ideas that only exist in the mind of God or people who see them