prawdomówny in English:

I don't think he is truthful.

She brought up her children to be truthful.

A man is never more truthful than when he acknowledges himself a liar.

I think you’re confusing being rude with being truthful

What makes you even think they might not be truthful?

To be quite truthful with you, I’m not very keen on this colour.

We have the strategy pointing in one direction, and your budget proposal is, to be truthful, pointing in another direction.

I think advertising companies should be more truthful about their products.

I'm a truthful person, I never lie.

Do you want a new world to live in, mirror of your deepest and most truthful desires?

His report was truthful.

A truthful politician? Pull the other one!

Truthful speech is not elegant, and elegant speech is not truthful. Good words are not persuasive, and persuasive words are not good. The knowledgeable are not many, and the many are not knowledgeable.