starry-eyed
adjective uk/ˌstɑː.riˈaɪd/ us/ˌstɑː.riˈaɪd/
天真的，过分乐观的，不切实际的
If you are starry-eyed, you have a lot of thoughts and opinions that are unreasonably positive, so you do not understand things as they really are.
It's easy to be starry-eyed about a place you've never been to. 人们很容易把从来没去过的地方想得过于美好。