Antonyms, or words with opposite meanings, for "pre-supposing" include "doubting," "questioning," "denying," and "rejecting." When someone pre-supposes something, they make an assumption without evidence or proof, while doubting or questioning something involves seeking evidence or proof before coming to a conclusion. Rejecting an assumption entirely means dismissing it as false, while denying something involves actively asserting the opposite of the assumption. Antonyms for "pre-supposing" highlight the importance of critical and logical thinking skills to properly evaluate situations and come to informed conclusions.