Main entry: bulletproof
Definition: make bulletproof
Usage: bulletproof the car
Main entry: bulletproof
Definition: not penetrable by bullets
Usage: bulletproof glass; bulletproof vest
Main entry: unassailable, bulletproof, unshakable, watertight
Definition: without flaws or loopholes
Usage: an ironclad contract; a watertight alibi; a bulletproof argument