| Indefeasibility (n.) The quality of being undefeasible. Thesaurus Entries certainty, fate, fatefulness, force majeure, indefeasibility, ineluctability, inescapableness, inevasibleness, inevitability, inevitable accident, inevitableness, inexorability, inflexibility, irrevocability, necessity, predetermination, relentlessness, sureness, unavoidable casualty, unavoidableness, uncontrollability, undeflectability, unpreventability, unyieldingness, vis major |