The word "more presupposed" can be quite complex, as it refers to something that is assumed or taken for granted to a higher degree. Finding an antonym for such a word may seem difficult, but some options include "less assumed," "not presupposed," or "less inferred." These alternatives suggest that whatever is being discussed is not taken as a given or is not assumed to such a degree. Another option could be to use words that emphasize the need for evidence or proof, such as "provable," "verifiable," or "backed up by evidence." In any case, antonyms for "more presupposed" would suggest a level of doubt or a need for verification that is absent in the original word.