Surmisings refer to the act of guessing or conjecturing about something. Antonyms for surmisings include certainties, truths, and facts. Certainties refer to a state of being absolutely sure or convinced of something, without a shadow of a doubt. Truths, on the other hand, are realities or facts that are proven to be accurate or correct. Facts are pieces of information that are verified, and they can be used to support a claim or argument. Contrary to surmisings, antonyms such as certainties, truths, and facts, are backed by evidence and logical reasoning, making them more reliable and trustworthy.