Antonyms for the phrase "declared true" may include "disclaimed false," "repudiated incorrect," or "retracted mistaken." These terms imply a reversal of a previously held belief or assertion. They may also suggest an admission of error or a change in perspective. Other antonyms could include "denied valid," "disputed factual," or "challenged verified." These words carry an air of skepticism and call into question the validity of a claim or statement. In any case, exploring antonyms for "declared true" allows for a deeper understanding of the complexity and nuance of language and human thought.