THESAURUS
unpreventable
certain, fated, fateful, indefeasible, ineluctable, inescapable, inevasible, inevitable, inexorable, inflexible, irresistible, irrevocable, necessary, relentless, resistless, sure, sure as death, sure as fate, unavoidable, uncontrollable, undeflectable, unstoppable, unyielding
