Although truthfulness is an admirable quality, it is not a requirement. We learned in 1998 that it is not even required when the President is under oath to tell the truth, the whole truth, and nothing but the truth.
Yes, the fact checkers have found little evidence otherwise.
habitual liar
comparative degree: more truthful superlative degree: most truthful
No, it is not an adverb. Truthful is an adjective, and the adverb form is "truthfully."
He will be truthful, that is the type of person he is.
yes it is truthful.
"you are not truthful"
More truthful
He was truthful as he explained what had happened. She was not truthful as she attempted to frame him for the crime.
yes he is very truthful
My sister is really truthful.
The noun form of the word "truthful" is "truthfulness."