0 someone who tells the truth, especially about what is really happening in a situation :
He said voters value the governor as a truth-teller who is more believable than traditional politicians.
These courageous truthtellers risk everything to shed light on wrongdoing.
It's an enormous irony that this instinctive truth-teller should have managed to tell such a great lie about Henry.
Trying to separate liars from truth-tellers has been the bane of investigators from ancient times.
In an analysis of five independent samples, a computer-based text analysis program correctly classified liars and truth-tellers at a rate of 67% when the topic was constant and a rate of 61% overall.
As a child, she felt herself cast in the role of family truthteller.
