[chc]

This definition would seem to make it impossible to be mistaken without lying. If you're wrong, the thing you said isn't true, so it's a lie. That hardly seems like a reasonable definition.

I would bet that you say things all the time that you do not know with 100% certainty but which seem likely enough than you assume them to be true. I have never met someone who does not.

For example, have you ever told somebody that you were meeting somebody else when you were not looking right at them as you prepared to sit down for the meeting? What you actually mean is that you believe you will meet them based on your understanding of a conversation you had. You could have heard the wrong day, they could be right about to cancel, your car could break down — you get the idea.