How honest are people, really?

How honest are people, really? Think about it. What do you hide from others? What are you afraid you of, that others don't know about? How honest are you really? Thank you to Ben for pointing out that maybe I am using the wrong word here. Maybe it's not honesty, maybe it's how much of the truth are you willing to share? When asked how you are - do you answer politely, Great! or do you tell them how you really are? If you are sitting with a group of mothers and you mention that you really don't find it rewarding (at least maybe not as much as you feel you ought to) and no one speaks up, is it because you are the only one, or because no one else wants to admit it? Why wouldn't you want to admit it? What is your reason, really?