What is the opposite of a fact?

The opposite of a fact is a falsehood or fiction, which refers to information or statements that are not true or lack verifiable evidence. While facts are objective and can be proven or supported by evidence, falsehoods are subjective and often arise from misunderstandings, misinterpretations, or intentional deception. In some contexts, opinions can also be considered the opposite of facts, as they reflect personal beliefs rather than objective reality.