English idioms relate to Truth, Secrecy, & Deception - Truthfulness

to behave in a way that reveals who a person truly is as opposed to whom they seem to be

to honestly share one's thoughts, feelings, or plans

truthfully and without any deception

to swear that one is telling the truth about something or is going to do something as promised

to make a confession about what one has done wrong or lied about, especially to gain relief

to make known an unpleasant truth about something

a conversation with children about disturbing topics like where babies come from or what is the goal of marriage are being discussed

in a way that involves no deception or rule violations

an unpleasant, yet truthful information someone reveals or points out about one

(of a hidden fact) to be eventually revealed or discovered