Counter-factual refers to something that is contrary to fact or reality, and an antonym for this word would be factual or realistic. Factual refers to information that is based on evidence or facts, and it is the opposite of something that is imaginary or nonexistent. Another antonym for counter-factual would be truthful or honest, which suggests that the information being presented is accurate and trustworthy. Additionally, the antonym for counter-factual could be actual, meaning something that truly happened or exists. Using antonyms can help us to better understand concepts and differentiate between what is real and what is not.