Truthfulness may refer to:
- Honesty—a moral character of a human being, related to telling the truth
- Accuracy—the propensity of information to be correct
- Incentive compatibility—a property of some strategic games that encourages participants to be honest about their preferences
See also:
- Truth - a concept most often used to mean in accord with fact or reality.
- Truthiness - a quality characterizing a "truth" that a person making an argument or assertion claims to know intuitively.
- Truthlikeness - a philosophical concept that distinguishes between the relative and apparent truth and falsity of assertions and hypotheses.
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