veracity

What it means

1. uncountableThe quality of speaking or stating the truth; truthfulness.

   Of course if you don't accept Conway's story, it means that you doubt either his veracity or his sanity—one may as well be frank.

   1933, James Hilton, Lost Horizon

2. countableSomething that is true; a truthful statement; a truth.
3. uncountableAgreement with the facts; accordance with the truth; accuracy or precision.

In a sentence

Of course if you don't accept Conway's story, it means that you doubt either his veracity or his sanity—one may as well be frank.

1933, James Hilton, Lost Horizon

Where it comes from

1. Latinvērāx“truthful, speaking truth”
2. Medieval Latinvērācitās“truthfulness”
3. Old Frenchveracitie
4. Middle Frenchvéracité
5. Englishveracity

From Middle French véracité, from Old French veracitie, from Medieval Latin vērācitās (“truthfulness”) (whence -acity), from Latin vērāx (“truthful, speaking truth”), from vērus (“true, real”). See very.