airtight ballproof bombproof bulletproof burglarproof chip-proof corrosionproof dampproof fire-resisting fireproof flameproof foolproof fractureproof hermetic holeproof impervious to infrangible leakproof noiseproof nonbreakable proof proof against punctureproof resistant rustproof shellproof soundproof tight unbreakable unshatterable watertight weatherproof