adaptable airtight ballproof bombproof bulletproof burglarproof certain convenient corrosionproof dampproof dependable ductile feasible fire-resisting fireproof flameproof flexible guaranteed handy hermetic holeproof impervious to infallible leakproof malleable manageable maneuverable noiseproof pliable pliant practical proof proof against punctureproof reliable resistant rustproof safe shatterproof shellproof soundproof sure sure-fire tight tractable trustworthy unfailing untroublesome warranted watertight weatherproof wieldable wieldy yielding