"Talks through one hat" is an idiomatic expression that signifies someone who is spouting nonsense, making up stories or simply lying. To convey the opposite meanings of this expression, one can use antonyms such as "honesty," "authenticity," "clarity," "truthfulness," or "genuineness." People who embody these qualities are honest, sincere, and authentic, and do not indulge in lies or falsehood. Rather, they communicate clearly, articulately, and in a straightforward manner, and never resort to fabricating stories. In essence, using the antonyms of "talks through one hat" highlights the importance of speaking the truth and being transparent in one's communication with others.