I trust Sarah completely because she is a truthful person who would never tell a lie.

We suspected that Ron was not being truthful when he said that he used to own a large catering company and that he grossed over ten million dollars in his first year.

Liars are always worried that they will get caught in the web of their own deceit, while truthful people do not experience such worries.

I was being entirely truthful when I told Melinda that I was impressed with her speaking skills and that I looked forward to hearing more from her in the future.

The judge made it clear that he did not believe the witness was being truthful in his testimony.