Is there a word for the following action:
Presume that we have a person who has never eaten parsley. He is speaking with another person who also has never eaten parsley. He tells that person that he doesn't like parsley because it's too spicy. He believes that it's true because someone else told him, so he's avoided parsley his whole life.
He's not lying, because that would imply he knows the truth but is intentionally saying otherwise. However, he's not being truthful either. Is there a word for this?