There are several antonyms for the word "out guessing," which means to make a correct prediction. Some possible antonyms are "misjudging," "guessing wrong," or "miscalculating." When you misjudge a situation or person, you make an incorrect assessment or estimate. Similarly, if you guess wrong, you make an inaccurate prediction without sufficient information or analysis. Miscalculating typically refers to making an error in mathematical or financial calculations. Other antonyms might include "winging it," "flying blind," or simply "not knowing." These terms suggest a lack of preparation, foresight, or knowledge, leading to uncertainty and potentially negative outcomes.