certainty, earthquake, fate, fatefulness, force majeure, freak accident, hurricane, indefeasibility, ineluctability, inescapableness, inevasibleness, inevitability, inevitable accident, inevitableness, inexorability, inflexibility, irrevocability, natural disaster, necessity, predetermination, relentlessness, sureness, tornado, unavoidable casualty, unavoidableness, uncontrollability, undeflectability, unforeseen event, unpreventability, unyieldingness, vis major