bulletproof

adj bulletproof

• impervious — not permitting penetration or passage; impenetrable: The coat is impervious to rain.
• impassable — not passable; not allowing passage over, through, along, etc.: Heavy snow made the roads impassable.
• close — When you close something such as a door or lid or when it closes, it moves so that a hole, gap, or opening is covered.
• compact — Compact things are small or take up very little space. You use this word when you think this is a good quality.
• firm — not soft or yielding when pressed; comparatively solid, hard, stiff, or rigid: firm ground; firm texture.