Un truisms are statements or beliefs that are not necessarily true, but are often repeated as if they were. Some antonyms for un truisms could include: facts, truths, certainty, reality, accuracy, authenticity, and validity. These words all suggest accuracy and truthfulness, which is opposite of the intent of un truisms. Other antonyms could include misstatements, inaccuracies, falsehoods, fallacies, errors, and untruths. In using these antonyms, we can emphasize the importance of accuracy and truthfulness, and challenge ourselves to seek out the actual facts instead of relying on commonly held beliefs that may be inaccurate or misleading.