<p><strong>Adjective</strong></p><ul><li>(of vehicles, glass, clothing, etc.) capable of resisting or absorbing the impact of a bullet</li><li>Informal. safe from failure; without errors or shortcomings and beyond criticism: a bulletproof system; a bulletproof budget</li></ul><p><strong>Verb</strong></p><ul><li>(used with object) to make (something) bulletproof</li></ul>