lacking in sophistication or worldliness; "a child's innocent stare"; "his ingenuous explanation that he would not have burned the church if he had not thought the bishop was in it"
If you describe someone as ingenuous, you mean that they are innocent, trusting, and honest. He seemed too ingenuous for a reporter disingenuous + ingenuously in·genu·ous·ly Somewhat ingenuously, he explains how the crime may be accomplished. an ingenuous person is simple, trusting, and honest, especially because they have not had much experience of life disingenuous (ingenuus , from gignere )