Un-truisms are statements that are not true and lack any factual basis. They may be misleading, confusing or outright false. In order to articulate ideas with clarity and truthfulness, it's important to use synonyms that convey the opposite meaning. Some of the synonyms for un-truisms include fallacies, falsehoods, inaccuracies, errors, misconceptions, myths, untruths, and misbeliefs. Using these words instead of the term un-truisms can make your statements more precise and accurate, avoiding confusion and misinterpretation. By choosing the right words, you can improve your communication and convey your message more effectively.