When it comes to making predictions or estimations, "rough guesses" are often unreliable and imprecise. However, there are certain antonyms for this term that can provide a more accurate measure of certainty and clarity. Some of the antonyms include "calculated guesses," "educated guesses," "informed estimates," "precise predictions," and "thorough projections." These terms imply a more careful and deliberate approach to making predictions, informed by data, research, or expert knowledge. By using these antonyms instead of "rough guesses," we can convey a greater degree of authority and confidence in our predictions, which is especially important when making important decisions or planning for the future.