Truthfulness

I started doubting the truthfulness of his statement.

Authenticity refers to truthfulness and veracity. To be authentic, you must in every situation be what you claim to be, and not present a false appearance.

The inconsistencies in his story raise doubts about the truthfulness of his statements.

Many hard-working students, alive to the deficiencies of this kind of romance-writing, have grown to distrust not only all historical writing that is romantic, but all historical writing that is vivid. They feel that complete truthfulness must never be sacrificed to color.