Synonyms and related words :
absolute, actual, admitting no question, confirmable, demonstrable, demonstratable, factual, historical, inappealable, incontestable, incontrovertible, indisputable, indubitable, irrefragable, irrefutable, provable, real, self-evident, testable, unanswerable, unanswered, unconfutable, unconfuted, uncontradicted, uncontroverted, undeniable, undenied, unimpeachable, unquestionable, unrefuted, verifiable