idealism

US /aɪˈdiː.ə.lɪ.zəm/
UK /aɪˈdiː.ə.lɪ.zəm/
1.

이상주의

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

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She never lost her youthful idealism and campaigned for just causes all her life.
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idealideally