Most imposturous is a term that describes something that is deceitful or fraudulent in nature. Antonyms for this word could include truthful, genuine, honest, or sincere. These words are used to describe something that is authentic, reliable, and trustworthy. They are the opposite of something that is deceitful or fraudulent. Additionally, other antonyms for most imposturous could include genuine, ethical, principled, or virtuous. These words all convey positive connotations and are used to describe things that are truly real and genuine. Using these antonyms instead of most imposturous can help provide clarity and improve communication in any situation.