"Prevaricative" indicates the act of evading or avoiding the truth, and its antonyms denote truthfulness, honesty, and straightforwardness. Some of the antonyms that can be used for the word "prevaricative" are truthful, candid, sincere, frank, honest, genuine, forthright, and straightforward. These words connote a sense of truthfulness and straightforwardness, which is in direct contrast to the evasive behavior that "prevaricative" suggests. Using antonyms like these can help to convey a sense of transparency and honesty, making it clear that the speaker is not trying to hide anything or mislead anyone. Therefore, one should use these antonyms instead of "prevaricative" to reflect honesty and transparency in communication.