the state or quality of being frank, open, and sincere in speech or expression

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Pope Benedict XVI has visited Ground Zero in New York, the scene of the 11 September 2001 attacks on Twin Towers, at the end of a six-day tour of the US.
With a candour that correspondents say has been a hallmark of this visit, he spoke publicly for the first time about being forced to join the Hitler Youth and being conscripted into the Nazi army.