1. designed to stop bullets from passing through
2. impossible to find fault with or criticize
Usage: figurative

1. to make something resistant to bullets or criticism

Examples

• The police officer wore a bulletproof vest during the raid.
• The armored car has bulletproof windows.
• Her alibi was bulletproof – no one could question it.
• The lawyer presented a bulletproof case to the jury.
• They need to bulletproof the building before the event.
• The company tried to bulletproof their security system.
• His argument was bulletproof and convinced everyone.