If you mean by polite than Honest. But if you mean they don't think things through some people refer to this as 'foot in mouth disease' (colloquial). Hope this helps!
tell the truth
Exaggerating is another word for stretching the truth
When you tell the truth The definition of admitted is: to confess, to permit, or to allow. it means to confess to something another words telling the truth.
To tell the truth
i solemnly swear to tell the truth and nothing but the truth
No, he is lying. If he were saying the truth, then, in theory, as he is a chicken, he would be lying. Then, he cannot tell the truth. So, he is lying. But, if he is lying, then all chickens say the truth, and he cannot be lying. The key lies in the word "all". He is lying that ALL chickens always lie, therefore not necessarily all chickens say the truth. It could be that some chickens always lie. The truth does not have to be the opposite. Therefore, he is lying that chickens always lie, and the truth is that "some chickens always lie".
To prevaricate means to lie, or to tell only part of the truth. It may also include one liar's fondness for, "telling the truth in a way no one will believe."
honesty
Another word for accepted as true is "acknowledged."
4+
I was urged to tell the truth by my friends.
Your truth does not seem to be my truth. Now tell me the truth, as you know it.