IRREFRAGABLE Meaning of IRREFRAGABLE in English adj.1 (of a statement, argument, or person) unanswerable, indisputable. 2 (of rules etc.) inviolable. Derivatives: irrefragably adv. Etymology: LL irrefragabilis (as IN-(1), refragari oppose) Oxford English vocab. Оксфордский английский словарь. 2012