The antonyms for the word "more honest to goodness" can vary depending on the context of the phrase. However, some possible antonyms could be less genuine, insincere, untrue, deceitful, or dishonest. These words suggest a lack of honesty, authenticity, or reliability. If someone is described as "less honest to goodness," it implies that they are not trustworthy or truthful. It may also suggest that they are putting on a façade or pretending to be someone they are not. In comparison, people who are described as "more honest to goodness" are seen as genuine, sincere, and trustworthy.