naive
adjective mainly disapproving (also naïve, naïf) uk/naɪˈiːv/ us/naɪˈiːv/
C1 轻信的;天真的;幼稚的
too willing to believe that someone is telling the truth, that people's intentions in general are good, or that life is simple and fair. People are often naive because they are young and/or have not had much experience of life
She was very naive to believe that he'd stay with her. 她居然天真地相信他会和她在一起。
They make the naive assumption that because it's popular it must be good. 他们幼稚地认为流行的就一定是好的。
It was a little naive of you to think that they would listen to your suggestions. 以为他们会听从你的建议，你真有点儿天真。